.. Licensed under the Apache License, Version 2.0 (the "License"); you may not
.. use this file except in compliance with the License. You may obtain a copy of
.. the License at
..
..   http://www.apache.org/licenses/LICENSE-2.0
..
.. Unless required by applicable law or agreed to in writing, software
.. distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
.. WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
.. License for the specific language governing permissions and limitations under
.. the License.

.. _api/server/root:

=====
``/``
=====

.. http:get:: /
    :synopsis: Returns the welcome message and version information

    Accessing the root of a CouchDB instance returns meta information about the
    instance. The response is a JSON structure containing information about the
    server, including a welcome message and the version of the server.

    :<header Accept: - :mimetype:`application/json`
                     - :mimetype:`text/plain`
    :>header Content-Type: - :mimetype:`application/json`
                           - :mimetype:`text/plain; charset=utf-8`
    :code 200: Request completed successfully

    **Request**:

    .. code-block:: http

        GET / HTTP/1.1
        Accept: application/json
        Host: localhost:5984

    **Response**:

    .. code-block:: http

        HTTP/1.1 200 OK
        Cache-Control: must-revalidate
        Content-Length: 179
        Content-Type: application/json
        Date: Sat, 10 Aug 2013 06:33:33 GMT
        Server: CouchDB (Erlang/OTP)

        {
            "couchdb": "Welcome",
            "uuid": "85fb71bf700c17267fef77535820e371",
            "vendor": {
                "name": "The Apache Software Foundation",
                "version": "1.3.1"
            },
            "version": "1.3.1"
        }

.. _api/server/active_tasks:

==================
``/_active_tasks``
==================

.. versionchanged:: 2.1.0 Because of how the scheduling replicator works, continuous replication jobs could be periodically stopped and then started later. When they are not running they will not appear in the ``_active_tasks`` endpoint

.. http:get:: /_active_tasks
    :synopsis: Obtains a list of the tasks running in the server

    List of running tasks, including the task type, name, status
    and process ID. The result is a JSON array of the currently running tasks,
    with each task being described with a single object. Depending on operation
    type set of response object fields might be different.

    :<header Accept: - :mimetype:`application/json`
                     - :mimetype:`text/plain`
    :>header Content-Type: - :mimetype:`application/json`
                           - :mimetype:`text/plain; charset=utf-8`
    :>json number changes_done: Processed changes
    :>json string database: Source database
    :>json string pid: Process ID
    :>json number progress: Current percentage progress
    :>json number started_on: Task start time as unix timestamp
    :>json string status: Task status message
    :>json string task: Task name
    :>json number total_changes: Total changes to process
    :>json string type: Operation Type
    :>json number updated_on: Unix timestamp of last operation update
    :code 200: Request completed successfully
    :code 401: CouchDB Server Administrator privileges required

    **Request**:

    .. code-block:: http

        GET /_active_tasks HTTP/1.1
        Accept: application/json
        Host: localhost:5984

    **Response**:

    .. code-block:: http

        HTTP/1.1 200 OK
        Cache-Control: must-revalidate
        Content-Length: 1690
        Content-Type: application/json
        Date: Sat, 10 Aug 2013 06:37:31 GMT
        Server: CouchDB (Erlang/OTP)

        [
            {
                "changes_done": 64438,
                "database": "mailbox",
                "pid": "<0.12986.1>",
                "progress": 84,
                "started_on": 1376116576,
                "total_changes": 76215,
                "type": "database_compaction",
                "updated_on": 1376116619
            },
            {
                "changes_done": 14443,
                "database": "mailbox",
                "design_document": "c9753817b3ba7c674d92361f24f59b9f",
                "pid": "<0.10461.3>",
                "progress": 18,
                "started_on": 1376116621,
                "total_changes": 76215,
                "type": "indexer",
                "updated_on": 1376116650
            },
            {
                "changes_done": 5454,
                "database": "mailbox",
                "design_document": "_design/meta",
                "pid": "<0.6838.4>",
                "progress": 7,
                "started_on": 1376116632,
                "total_changes": 76215,
                "type": "indexer",
                "updated_on": 1376116651
            },
            {
                "checkpointed_source_seq": 68585,
                "continuous": false,
                "doc_id": null,
                "doc_write_failures": 0,
                "docs_read": 4524,
                "docs_written": 4524,
                "missing_revisions_found": 4524,
                "pid": "<0.1538.5>",
                "progress": 44,
                "replication_id": "9bc1727d74d49d9e157e260bb8bbd1d5",
                "revisions_checked": 4524,
                "source": "mailbox",
                "source_seq": 154419,
                "started_on": 1376116644,
                "target": "http://mailsrv:5984/mailbox",
                "type": "replication",
                "updated_on": 1376116651
            }
        ]

.. _api/server/all_dbs:

=============
``/_all_dbs``
=============

.. http:get:: /_all_dbs
    :synopsis: Returns a list of all the databases

    Returns a list of all the databases in the CouchDB instance.

    :<header Accept: - :mimetype:`application/json`
                     - :mimetype:`text/plain`
    :>header Content-Type: - :mimetype:`application/json`
                           - :mimetype:`text/plain; charset=utf-8`
    :code 200: Request completed successfully

    **Request**:

    .. code-block:: http

        GET /_all_dbs HTTP/1.1
        Accept: application/json
        Host: localhost:5984

    **Response**:

    .. code-block:: http

        HTTP/1.1 200 OK
        Cache-Control: must-revalidate
        Content-Length: 52
        Content-Type: application/json
        Date: Sat, 10 Aug 2013 06:57:48 GMT
        Server: CouchDB (Erlang/OTP)

        [
           "_users",
           "contacts",
           "docs",
           "invoices",
           "locations"
        ]

.. _api/server/cluster_setup:

===================
``/_cluster_setup``
===================

.. versionadded: 2.0
.. http:get:: /_cluster_setup
    :synopsis: Return the status of the cluster setup wizard

    Returns the status of the node or cluster, per the cluster setup wizard.

    :<header Accept: - :mimetype:`application/json`
                     - :mimetype:`text/plain`
    :query array ensure_dbs_exist: List of system databases to ensure exist
        on the node/cluster. Defaults to
        ``["_users","_replicator","_global_changes"]``.
    :>header Content-Type: - :mimetype:`application/json`
                           - :mimetype:`text/plain; charset=utf-8`
    :>json string state: Current ``state`` of the node and/or cluster (see
        below)
    :code 200: Request completed successfully

    The ``state`` returned indicates the current node or cluster state, and
    is one of the following:

    - ``cluster_disabled``: The current node is completely unconfigured.
    - ``single_node_disabled``: The current node is configured as a single
      (standalone) node (``[cluster] n=1``), but either does not have a
      server-level admin user defined, or does not have the standard system
      databases created. If the ``ensure_dbs_exist`` query parameter is
      specified, the list of databases provided overrides the default list
      of standard system databases.
    - ``single_node_enabled``: The current node is configured as a single
      (standalone) node, has a server-level admin user defined, and has
      the ``ensure_dbs_exist`` list (explicit or default) of databases
      created.
    - ``cluster_enabled``: The current node has ``[cluster] n`` > 1, is not
      bound to ``127.0.0.1`` and has a server-level admin user defined.
      However, the full set of standard system databases have not been
      created yet. If the ``ensure_dbs_exist`` query parameter is
      specified, the list of databases provided overrides the default list
      of standard system databases.
    - ``cluster_finished``: The current node has ``[cluster] n`` > 1, is not
      bound to ``127.0.0.1``, has a server-level admin user defined *and*
      has the ``ensure_dbs_exist`` list (explicit or default) of databases
      created.

    **Request**:

    .. code-block:: http

        GET /_cluster_setup HTTP/1.1
        Accept: application/json
        Host: localhost:5984

    **Response**:

    .. code-block:: http

        HTTP/1.1 200 OK
        X-CouchDB-Body-Time: 0
        X-Couch-Request-ID: 5c058bdd37
        Server: CouchDB/2.1.0-7f17678 (Erlang OTP/17)
        Date: Sun, 30 Jul 2017 06:33:18 GMT
        Content-Type: application/json
        Content-Length: 29
        Cache-Control: must-revalidate

        {"state":"cluster_enabled"}

.. http:post:: /_cluster_setup
    :synopsis: Sets up a node as a single node or as part of a cluster.

    Configure a node as a single (standalone) node, as part of a cluster,
    or finalise a cluster.

    :<header Accept: - :mimetype:`application/json`
                     - :mimetype:`text/plain`
    :<header Content-Type: :mimetype:`application/json`
    :<json string action: - **enable_single_node**: Configure the current node
                            as a single, standalone CouchDB server.
                          - **enable_cluster**: Configure the local or remote
                            node as one node, preparing it to be joined to a
                            new CouchDB cluster.
                          - **add_node**: Add the specified remote node to
                            this cluster's list of nodes, joining it to the
                            cluster.
                          - **finish_cluster**: Finalise the cluster by
                            creating the standard system databases.
    :<json string bind_address: The IP address to which to bind the current
        node. The special value ``0.0.0.0`` may be specified to bind to all
        interfaces on the host. (enable_cluster and enable_single_node only)
    :<json string username: The username of the server-level administrator to
        create. (enable_cluster and enable_single_node only), or the remote
        server's administrator username (add_node)
    :<json string password: The password for the server-level administrator to
        create. (enable_cluster and enable_single_node only), or the remote
        server's administrator username (add_node)
    :<json number port: The TCP port to which to bind this node
        (enable_cluster and enable_single_node only) or the TCP port to which
        to bind a remote node (add_node only).
    :<json number node_count: The total number of nodes to be joined into
        the cluster, including this one. Used to determine the value of the
        cluster's ``n``, up to a maximum of 3. (enable_cluster only)
    :<json string remote_node: The IP address of the remote node to setup as
        part of this cluster's list of nodes. (enable_cluster only)
    :<json string remote_current_user: The username of the server-level
        administrator authorized on the remote node. (enable_cluster only)
    :<json string remote_current_password: The password of the server-level
        administrator authorized on the remote node. (enable_cluster only)
    :<json string host: The remote node IP of the node to add to the cluster.
        (add_node only)
    :<json array ensure_dbs_exist: List of system databases to ensure exist
        on the node/cluster. Defaults to
        ``["_users","_replicator","_global_changes"]``.

    *No example request/response included here. For a worked example, please
    see* :ref:`cluster/setup/api`.

.. _api/server/db_updates:

================
``/_db_updates``
================

.. versionadded:: 1.4

.. http:get:: /_db_updates
    :synopsis: Return the server changes of databases

    Returns a list of all database events in the CouchDB instance.

    :<header Accept: - :mimetype:`application/json`
                     - :mimetype:`text/plain`
    :query string feed: - **normal**: Returns all historical DB changes, then
                          closes the connection. *Default.*
                        - **longpoll**: Closes the connection after the first
                          event.
                        - **continuous**: Send a line of JSON per event.
                          Keeps the socket open until ``timeout``.
                        - **eventsource**: Like, ``continuous``, but sends
                          the events in `EventSource
                          <http://dev.w3.org/html5/eventsource/>`_ format.
    :query number timeout: Number of seconds until CouchDB closes the
      connection. Default is ``60``.
    :query number heartbeat: Period in *milliseconds* after which an empty
        line is sent in the results. Only applicable for ``longpoll``,
        ``continuous``, and ``eventsource`` feeds. Overrides any timeout to
        keep the feed alive indefinitely. Default is ``60000``. May be ``true``
        to use default value.
    :query string since: Return only updates since the specified sequence ID.
        May be the string ``now`` to begin showing only new updates.
    :>header Content-Type: - :mimetype:`application/json`
                           - :mimetype:`text/plain; charset=utf-8`
    :>header Transfer-Encoding: ``chunked``
    :>json array results: An array of database events. For ``longpoll`` and
        ``continuous`` modes, the entire response is the contents of the
        ``results`` array.
    :>json string last_seq: The last sequence ID reported.
    :code 200: Request completed successfully
    :code 401: CouchDB Server Administrator privileges required

    The ``results`` field of database updates:

    :json string db_name: Database name.
    :json string type: A database event is one of ``created``, ``updated``,
      ``deleted``.
    :json json seq: Update sequence of the event.

    **Request**:

    .. code-block:: http

        GET /_db_updates HTTP/1.1
        Accept: application/json
        Host: localhost:5984

    **Response**:

    .. code-block:: http

        HTTP/1.1 200 OK
        Cache-Control: must-revalidate
        Content-Type: application/json
        Date: Sat, 18 Mar 2017 19:01:35 GMT
        Etag: "C1KU98Y6H0LGM7EQQYL6VSL07"
        Server: CouchDB/2.0.0 (Erlang OTP/17)
        Transfer-Encoding: chunked
        X-Couch-Request-ID: ad87efc7ff
        X-CouchDB-Body-Time: 0

        {
            "results":[
                {"db_name":"mailbox","type":"created","seq":"1-g1AAAAFReJzLYWBg4MhgTmHgzcvPy09JdcjLz8gvLskBCjMlMiTJ____PyuDOZExFyjAnmJhkWaeaIquGIf2JAUgmWQPMiGRAZcaB5CaePxqEkBq6vGqyWMBkgwNQAqobD4h"},
                {"db_name":"mailbox","type":"deleted","seq":"2-g1AAAAFReJzLYWBg4MhgTmHgzcvPy09JdcjLz8gvLskBCjMlMiTJ____PyuDOZEpFyjAnmJhkWaeaIquGIf2JAUgmWQPMiGRAZcaB5CaePxqEkBq6vGqyWMBkgwNQAqobD4hdQsg6vYTUncAou4-IXUPIOpA7ssCAIFHa60"},
            ],
            "last_seq": "2-g1AAAAFReJzLYWBg4MhgTmHgzcvPy09JdcjLz8gvLskBCjMlMiTJ____PyuDOZEpFyjAnmJhkWaeaIquGIf2JAUgmWQPMiGRAZcaB5CaePxqEkBq6vGqyWMBkgwNQAqobD4hdQsg6vYTUncAou4-IXUPIOpA7ssCAIFHa60"
        }

.. _api/server/membership:

================
``/_membership``
================

.. versionadded:: 2.0

.. http:get:: /_membership
    :synopsis: Returns a list of nodes

    Displays the nodes that are part of the cluster as ``cluster_nodes``. The
    field ``all_nodes`` displays all nodes this node knows about, including the
    ones that are part of the cluster. The endpoint is useful when setting up a
    cluster, see :ref:`cluster/nodes`

    :<header Accept: - :mimetype:`application/json`
                     - :mimetype:`text/plain`
    :>header Content-Type: - :mimetype:`application/json`
                           - :mimetype:`text/plain; charset=utf-8`
    :code 200: Request completed successfully

    **Request**:

    .. code-block:: http

        GET /_membership HTTP/1.1
        Accept: application/json
        Host: localhost:5984

    **Response**:

    .. code-block:: http

        HTTP/1.1 200 OK
        Cache-Control: must-revalidate
        Content-Type: application/json
        Date: Sat, 11 Jul 2015 07:02:41 GMT
        Server: CouchDB (Erlang/OTP)
        Content-Length: 142

        {
            "all_nodes": [
                "node1@127.0.0.1",
                "node2@127.0.0.1",
                "node3@127.0.0.1"
            ],
            "cluster_nodes": [
                "node1@127.0.0.1",
                "node2@127.0.0.1",
                "node3@127.0.0.1"
            ]
        }

.. _api/server/replicate:

===============
``/_replicate``
===============

.. http:post:: /_replicate
    :synopsis: Starts or cancels the replication

    Request, configure, or stop, a replication operation.

    :<header Accept: - :mimetype:`application/json`
                     - :mimetype:`text/plain`
    :<header Content-Type: :mimetype:`application/json`
    :<json boolean cancel: Cancels the replication
    :<json boolean continuous: Configure the replication to be continuous
    :<json boolean create_target: Creates the target database.
      Required administrator's privileges on target server.
    :<json array doc_ids: Array of document IDs to be synchronized
    :<json string filter: The name of a :ref:`filter function <filterfun>`.
    :<json string proxy: Address of a proxy server through which replication
      should occur (protocol can be "http" or "socks5")
    :<json string source: Source database name or URL
    :<json string target: Target database name or URL
    :>header Content-Type: - :mimetype:`application/json`
                           - :mimetype:`text/plain; charset=utf-8`
    :>json array history: Replication history (see below)
    :>json boolean ok: Replication status
    :>json number replication_id_version: Replication protocol version
    :>json string session_id: Unique session ID
    :>json number source_last_seq: Last sequence number read from source
      database
    :code 200: Replication request successfully completed
    :code 202: Continuous replication request has been accepted
    :code 400: Invalid JSON data
    :code 401: CouchDB Server Administrator privileges required
    :code 404: Either the source or target DB is not found or attempt to
      cancel unknown replication task
    :code 500: JSON specification was invalid

    The specification of the replication request is controlled through the
    JSON content of the request. The JSON should be an object with the
    fields defining the source, target and other options.

    The `Replication history` is an array of objects with following structure:

    :json number doc_write_failures: Number of document write failures
    :json number docs_read:  Number of documents read
    :json number docs_written:  Number of documents written to target
    :json number end_last_seq:  Last sequence number in changes stream
    :json string end_time:  Date/Time replication operation completed in
      :rfc:`2822` format
    :json number missing_checked:  Number of missing documents checked
    :json number missing_found:  Number of missing documents found
    :json number recorded_seq:  Last recorded sequence number
    :json string session_id:  Session ID for this replication operation
    :json number start_last_seq:  First sequence number in changes stream
    :json string start_time:  Date/Time replication operation started in
      :rfc:`2822` format

    **Request**

    .. code-block:: http

        POST /_replicate HTTP/1.1
        Accept: application/json
        Content-Length: 36
        Content-Type: application/json
        Host: localhost:5984

        {
            "source": "db_a",
            "target": "db_b"
        }

    **Response**

    .. code-block:: http

        HTTP/1.1 200 OK
        Cache-Control: must-revalidate
        Content-Length: 692
        Content-Type: application/json
        Date: Sun, 11 Aug 2013 20:38:50 GMT
        Server: CouchDB (Erlang/OTP)

        {
            "history": [
                {
                    "doc_write_failures": 0,
                    "docs_read": 10,
                    "docs_written": 10,
                    "end_last_seq": 28,
                    "end_time": "Sun, 11 Aug 2013 20:38:50 GMT",
                    "missing_checked": 10,
                    "missing_found": 10,
                    "recorded_seq": 28,
                    "session_id": "142a35854a08e205c47174d91b1f9628",
                    "start_last_seq": 1,
                    "start_time": "Sun, 11 Aug 2013 20:38:50 GMT"
                },
                {
                    "doc_write_failures": 0,
                    "docs_read": 1,
                    "docs_written": 1,
                    "end_last_seq": 1,
                    "end_time": "Sat, 10 Aug 2013 15:41:54 GMT",
                    "missing_checked": 1,
                    "missing_found": 1,
                    "recorded_seq": 1,
                    "session_id": "6314f35c51de3ac408af79d6ee0c1a09",
                    "start_last_seq": 0,
                    "start_time": "Sat, 10 Aug 2013 15:41:54 GMT"
                }
            ],
            "ok": true,
            "replication_id_version": 3,
            "session_id": "142a35854a08e205c47174d91b1f9628",
            "source_last_seq": 28
        }

Replication Operation
=====================

The aim of the replication is that at the end of the process, all active
documents on the source database are also in the destination database and all
documents that were deleted in the source databases are also deleted (if they
exist) on the destination database.

Replication can be described as either push or pull replication:

- *Pull replication* is where the ``source`` is the remote CouchDB instance,
  and the ``target`` is the local database.

  Pull replication is the most useful solution to use if your source database
  has a permanent IP address, and your destination (local) database may have a
  dynamically assigned IP address (for example, through DHCP). This is
  particularly important if you are replicating to a mobile or other device
  from a central server.

- *Push replication* is where the ``source`` is a local database, and
  ``target`` is a remote database.

Specifying the Source and Target Database
=========================================

You must use the URL specification of the CouchDB database if you want to
perform replication in either of the following two situations:

- Replication with a remote database (i.e. another instance of CouchDB on the
  same host, or a different host)

- Replication with a database that requires authentication

For example, to request replication between a database local to the CouchDB
instance to which you send the request, and a remote database you might use the
following request:

.. code-block:: http

    POST http://couchdb:5984/_replicate HTTP/1.1
    Content-Type: application/json
    Accept: application/json

    {
        "source" : "recipes",
        "target" : "http://coucdb-remote:5984/recipes",
    }

In all cases, the requested databases in the ``source`` and ``target``
specification must exist. If they do not, an error will be returned within the
JSON object:

.. code-block:: javascript

    {
        "error" : "db_not_found"
        "reason" : "could not open http://couchdb-remote:5984/ol1ka/",
    }

You can create the target database (providing your user credentials allow it)
by adding the ``create_target`` field to the request object:

.. code-block:: http

    POST http://couchdb:5984/_replicate HTTP/1.1
    Content-Type: application/json
    Accept: application/json

    {
        "create_target" : true
        "source" : "recipes",
        "target" : "http://couchdb-remote:5984/recipes",
    }

The ``create_target`` field is not destructive. If the database already
exists, the replication proceeds as normal.

Single Replication
==================

You can request replication of a database so that the two databases can be
synchronized. By default, the replication process occurs one time and
synchronizes the two databases together. For example, you can request a single
synchronization between two databases by supplying the ``source`` and
``target`` fields within the request JSON content.

.. code-block:: http

    POST http://couchdb:5984/_replicate HTTP/1.1
    Accept: application/json
    Content-Type: application/json

    {
        "source" : "recipes",
        "target" : "recipes-snapshot",
    }

In the above example, the databases ``recipes`` and ``recipes-snapshot`` will
be synchronized. These databases are local to the CouchDB instance where the
request was made. The response will be a JSON structure containing the success
(or failure) of the synchronization process, and statistics about the process:

.. code-block:: javascript

    {
        "ok" : true,
        "history" : [
            {
                "docs_read" : 1000,
                "session_id" : "52c2370f5027043d286daca4de247db0",
                "recorded_seq" : 1000,
                "end_last_seq" : 1000,
                "doc_write_failures" : 0,
                "start_time" : "Thu, 28 Oct 2010 10:24:13 GMT",
                "start_last_seq" : 0,
                "end_time" : "Thu, 28 Oct 2010 10:24:14 GMT",
                "missing_checked" : 0,
                "docs_written" : 1000,
                "missing_found" : 1000
            }
        ],
        "session_id" : "52c2370f5027043d286daca4de247db0",
        "source_last_seq" : 1000
    }

Continuous Replication
======================

Synchronization of a database with the previously noted methods happens only
once, at the time the replicate request is made. To have the target database
permanently replicated from the source, you must set the ``continuous`` field
of the JSON object within the request to true.

With continuous replication changes in the source database are replicated to
the target database in perpetuity until you specifically request that
replication ceases.

.. code-block:: http

    POST http://couchdb:5984/_replicate HTTP/1.1
    Accept: application/json
    Content-Type: application/json

    {
        "continuous" : true
        "source" : "recipes",
        "target" : "http://couchdb-remote:5984/recipes",
    }

Changes will be replicated between the two databases as long as a network
connection is available between the two instances.

.. note::
    Two keep two databases synchronized with each other, you need to set
    replication in both directions; that is, you must replicate from ``source``
    to ``target``, and separately from ``target`` to ``source``.

Canceling Continuous Replication
================================

You can cancel continuous replication by adding the ``cancel`` field to the
JSON request object and setting the value to true. Note that the structure of
the request must be identical to the original for the cancellation request to
be honoured. For example, if you requested continuous replication, the
cancellation request must also contain the ``continuous`` field.

For example, the replication request:

.. code-block:: http

    POST http://couchdb:5984/_replicate HTTP/1.1
    Content-Type: application/json
    Accept: application/json

    {
        "source" : "recipes",
        "target" : "http://couchdb-remote:5984/recipes",
        "create_target" : true,
        "continuous" : true
    }

Must be canceled using the request:

.. code-block:: http

    POST http://couchdb:5984/_replicate HTTP/1.1
    Accept: application/json
    Content-Type: application/json

    {
        "cancel" : true,
        "continuous" : true
        "create_target" : true,
        "source" : "recipes",
        "target" : "http://couchdb-remote:5984/recipes",
    }

Requesting cancellation of a replication that does not exist results in a 404
error.

.. _api/server/_scheduler/jobs:

====================
``/_scheduler/jobs``
====================

.. http:get:: /_scheduler/jobs
    :synopsis: Retrieve information about replication jobs

    List of replication jobs. Includes replications created via
    :ref:`api/server/replicate` endpoint as well as those created from
    replication documents. Does not include replications which have completed
    or have failed to start because replication documents were malformed. Each
    job description will include source and target information, replication id,
    a history of recent event, and a few other things.

    :<header Accept: - :mimetype:`application/json`
    :>header Content-Type: - :mimetype:`application/json`
    :query number limit: How many results to return
    :query number skip: How many result to skip starting at the beginning,
                        ordered by replication ID
    :>json number offset: How many results were skipped
    :>json number total_rows: Total number of replication jobs
    :>json string id: Replication ID.
    :>json string database: Replication document database
    :>json string doc_id: Replication document ID
    :>json list history: Timestamped history of events as a list of objects
    :>json string pid: Replication process ID
    :>json string node: Cluster node where the job is running
    :>json string source: Replication source
    :>json string target: Replication target
    :>json string start_time: Timestamp of when the replication was started
    :code 200: Request completed successfully
    :code 401: CouchDB Server Administrator privileges required

    **Request**:

    .. code-block:: http

        GET /_scheduler/jobs HTTP/1.1
        Accept: application/json
        Host: localhost:5984

    **Response**:

    .. code-block:: http

        HTTP/1.1 200 OK
        Cache-Control: must-revalidate
        Content-Length: 1690
        Content-Type: application/json
        Date: Sat, 29 Apr 2017 05:05:16 GMT
        Server: CouchDB (Erlang/OTP)

        {
            "jobs": [
                {
                    "database": "_replicator",
                    "doc_id": "cdyno-0000001-0000003",
                    "history": [
                        {
                            "timestamp": "2017-04-29T05:01:37Z",
                            "type": "started"
                        },
                        {
                            "timestamp": "2017-04-29T05:01:37Z",
                            "type": "added"
                        }
                    ],
                    "id": "8f5b1bd0be6f9166ccfd36fc8be8fc22+continuous",
                    "node": "node1@127.0.0.1",
                    "pid": "<0.1850.0>",
                    "source": "http://myserver.com/foo",
                    "start_time": "2017-04-29T05:01:37Z",
                    "target": "http://adm:*****@localhost:15984/cdyno-0000003/",
                    "user": null
                },
                {
                    "database": "_replicator",
                    "doc_id": "cdyno-0000001-0000002",
                    "history": [
                        {
                            "timestamp": "2017-04-29T05:01:37Z",
                            "type": "started"
                        },
                        {
                            "timestamp": "2017-04-29T05:01:37Z",
                            "type": "added"
                        }
                    ],
                    "id": "e327d79214831ca4c11550b4a453c9ba+continuous",
                    "node": "node2@127.0.0.1",
                    "pid": "<0.1757.0>",
                    "source": "http://myserver.com/foo",
                    "start_time": "2017-04-29T05:01:37Z",
                    "target": "http://adm:*****@localhost:15984/cdyno-0000002/",
                    "user": null
                }
            ],
            "offset": 0,
            "total_rows": 2
         }

.. _api/server/_scheduler/docs:

====================
``/_scheduler/docs``
====================

.. versionchanged:: 2.1.0 Use this endpoint to monitor the state of
                    document-based replications. Previously needed to poll both
                    documents and ``_active_tasks`` to get a complete state
                    summary

.. http:get:: /_scheduler/docs
    :synopsis: Retrieve information about replication documents from the
               ``_replicator`` database.

    List of replication document states. Includes information about all the
    documents, even in ``completed`` and ``failed`` states. For each document
    it returns the document ID, the database, the replication ID, source and
    target, and other information.

    :<header Accept: - :mimetype:`application/json`
    :>header Content-Type: - :mimetype:`application/json`
    :query number limit: How many results to return
    :query number skip: How many result to skip starting at the beginning, if
                        ordered by document ID
    :>json number offset: How many results were skipped
    :>json number total_rows: Total number of replication documents.
    :>json string id: Replication ID, or ``null`` if state is ``completed`` or
                      ``failed``
    :>json string state: One of following states (see :ref:`replicator/states`
                         for descriptions): ``initializing``, ``running``,
                         ``completed``, ``pending``, ``crashing``, ``error``,
                         ``failed``
    :>json string database: Database where replication document came from
    :>json string doc_id: Replication document ID
    :>json string node: Cluster node where the job is running
    :>json string source: Replication source
    :>json string target: Replication target
    :>json string start_time: Timestamp of when the replication was started
    :>json string last_update: Timestamp of last state update
    :>json string info: Additional information about the state, such as an
                        error message for example
    :>json number error_count: Consecutive errors count. Indicates how many
                               times in a row this replication has crashed.
                               Replication will be retried with an exponential
                               backoff based on this number. As soon as the
                               replication succeeds this count is reset to 0.
                               To can be used to get an idea why a particular
                               replication is not making progress.
    :code 200: Request completed successfully
    :code 401: CouchDB Server Administrator privileges required

    **Request**:

    .. code-block:: http

        GET /_scheduler/docs HTTP/1.1
        Accept: application/json
        Host: localhost:5984

    **Response**:

    .. code-block:: http

        HTTP/1.1 200 OK
        Content-Type: application/json
        Date: Sat, 29 Apr 2017 05:10:08 GMT
        Server: Server: CouchDB (Erlang/OTP)
        Transfer-Encoding: chunked

        {
            "docs": [
                {
                    "database": "_replicator",
                    "doc_id": "cdyno-0000001-0000002",
                    "error_count": 0,
                    "id": "e327d79214831ca4c11550b4a453c9ba+continuous",
                    "info": null,
                    "last_updated": "2017-04-29T05:01:37Z",
                    "node": "node2@127.0.0.1",
                    "proxy": null,
                    "source": "http://myserver.com/foo",
                    "start_time": "2017-04-29T05:01:37Z",
                    "state": "running",
                    "target": "http://adm:*****@localhost:15984/cdyno-0000002/"
                },
                {
                    "database": "_replicator",
                    "doc_id": "cdyno-0000001-0000003",
                    "error_count": 0,
                    "id": "8f5b1bd0be6f9166ccfd36fc8be8fc22+continuous",
                    "info": null,
                    "last_updated": "2017-04-29T05:01:37Z",
                    "node": "node1@127.0.0.1",
                    "proxy": null,
                    "source": "http://myserver.com/foo",
                    "start_time": "2017-04-29T05:01:37Z",
                    "state": "running",
                    "target": "http://adm:*****@localhost:15984/cdyno-0000003/"
                }
            ],
            "offset": 0,
            "total_rows": 2
        }

.. http:get:: /_scheduler/docs/{replicator_db}
    :synopsis: Retrieve information about replication documents from a specific
               replicator database.

    Get information about replication documents from a replicator database.
    The default replicator database is ``_replicator`` but other replicator
    databases can exist if their name ends with the suffix ``/_replicator``.

    .. note:: As a convenience slashes (``/``) in replicator db names do not
       have to be escaped. So ``/_scheduler/docs/other/_replicator`` is valid
       and equivalent to ``/_scheduler/docs/other%2f_replicator``

    :<header Accept: - :mimetype:`application/json`
    :>header Content-Type: - :mimetype:`application/json`
    :query number limit: How many results to return
    :query number skip: How many result to skip starting at the beginning, if
                        ordered by document ID
    :>json number offset: How many results were skipped
    :>json number total_rows: Total number of replication documents.
    :>json string id: Replication ID, or ``null`` if state is ``completed`` or
                      ``failed``
    :>json string state: One of following states (see :ref:`replicator/states`
                         for descriptions): ``initializing``, ``running``,
                         ``completed``, ``pending``, ``crashing``, ``error``,
                         ``failed``
    :>json string database: Database where replication document came from
    :>json string doc_id: Replication document ID
    :>json string node: Cluster node where the job is running
    :>json string source: Replication source
    :>json string target: Replication target
    :>json string start_time: Timestamp of when the replication was started
    :>json string last_update: Timestamp of last state update
    :>json string info: Additional information about the state, such as an
                        error message for example
    :>json number error_count: Consecutive errors count. Indicates how many
                               times in a row this replication has crashed.
                               Replication will be retried with an exponential
                               backoff based on this number. As soon as the
                               replication succeeds this count is reset to 0.
                               To can be used to get an idea why a particular
                               replication is not making progress.
    :code 200: Request completed successfully
    :code 401: CouchDB Server Administrator privileges required

    **Request**:

    .. code-block:: http

        GET /_scheduler/docs/other/_replicator HTTP/1.1
        Accept: application/json
        Host: localhost:5984

    **Response**:

    .. code-block:: http

        HTTP/1.1 200 OK
        Content-Type: application/json
        Date: Sat, 29 Apr 2017 05:10:08 GMT
        Server: Server: CouchDB (Erlang/OTP)
        Transfer-Encoding: chunked

        {
            "docs": [
                {
                    "database": "other/_replicator",
                    "doc_id": "cdyno-0000001-0000002",
                    "error_count": 0,
                    "id": "e327d79214831ca4c11550b4a453c9ba+continuous",
                    "info": null,
                    "last_updated": "2017-04-29T05:01:37Z",
                    "node": "node2@127.0.0.1",
                    "proxy": null,
                    "source": "http://myserver.com/foo",
                    "start_time": "2017-04-29T05:01:37Z",
                    "state": "running",
                    "target": "http://adm:*****@localhost:15984/cdyno-0000002/"
                }
            ],
            "offset": 0,
            "total_rows": 1
        }

.. http:get:: /_scheduler/docs/{replicator_db}/{docid}
    :synopsis: Retrieve information about a particular replication document

    .. note:: As a convenience slashes (``/``) in replicator db names do not
       have to be escaped. So ``/_scheduler/docs/other/_replicator`` is valid
       and equivalent to ``/_scheduler/docs/other%2f_replicator``

    :<header Accept: - :mimetype:`application/json`
    :>header Content-Type: - :mimetype:`application/json`
    :>json string id: Replication ID, or ``null`` if state is ``completed`` or
                      ``failed``
    :>json string state: One of following states (see :ref:`replicator/states`
                         for descriptions): ``initializing``, ``running``,
                         ``completed``, ``pending``, ``crashing``, ``error``,
                         ``failed``
    :>json string database: Database where replication document came from
    :>json string doc_id: Replication document ID
    :>json string node: Cluster node where the job is running
    :>json string source: Replication source
    :>json string target: Replication target
    :>json string start_time: Timestamp of when the replication was started
    :>json string last_update: Timestamp of last state update
    :>json string info: Additional information about the state, such as an
                        error message for example
    :>json number error_count: Consecutive errors count. Indicates how many
                               times in a row this replication has crashed.
                               Replication will be retried with an exponential
                               backoff based on this number. As soon as the
                               replication succeeds this count is reset to 0.
                               To can be used to get an idea why a particular
                               replication is not making progress.
    :code 200: Request completed successfully

     **Request**:

    .. code-block:: http

        GET /_scheduler/docs/other/_replicator/cdyno-0000001-0000002 HTTP/1.1
        Accept: application/json
        Host: localhost:5984

    **Response**:

    .. code-block:: http

        HTTP/1.1 200 OK
        Content-Type: application/json
        Date: Sat, 29 Apr 2017 05:10:08 GMT
        Server: Server: CouchDB (Erlang/OTP)
        Transfer-Encoding: chunked

        {
            "database": "other/_replicator",
            "doc_id": "cdyno-0000001-0000002",
            "error_count": 0,
            "id": "e327d79214831ca4c11550b4a453c9ba+continuous",
            "info": null,
            "last_updated": "2017-04-29T05:01:37Z",
            "node": "node2@127.0.0.1",
            "proxy": null,
            "source": "http://myserver.com/foo",
            "start_time": "2017-04-29T05:01:37Z",
            "state": "running",
            "target": "http://adm:*****@localhost:15984/cdyno-0000002/"
        }

.. _api/server/restart:

=============
``/_restart``
=============

.. http:post:: /_restart
    :synopsis: Restarts the server

    Restarts the CouchDB instance. You must be authenticated as a user with
    administration privileges for this to work.

    :<header Accept: - :mimetype:`application/json`
                     - :mimetype:`text/plain`
    :<header Content-Type: :mimetype:`application/json`
    :>header Content-Type: - :mimetype:`application/json`
                           - :mimetype:`text/plain; charset=utf-8`
    :code 202: Server goes to restart (there is no guarantee that it will be
      alive after)
    :code 401: CouchDB Server Administrator privileges required
    :code 415: Bad request`s :header:`Content-Type`

    **Request**:

    .. code-block:: http

        POST /_restart HTTP/1.1
        Accept: application/json
        Host: localhost:5984

    **Response**:

    .. code-block:: http

        HTTP/1.1 202 Accepted
        Cache-Control: must-revalidate
        Content-Length: 12
        Content-Type: application/json
        Date: Sat, 10 Aug 2013 11:33:50 GMT
        Server: CouchDB (Erlang/OTP)

        {
            "ok": true
        }

.. _api/server/stats:

===========
``/_stats``
===========

.. http:get:: /_stats
    :synopsis: Returns server statistics

    The ``_stats`` resource returns a JSON object containing the statistics
    for the running server. The object is structured with top-level sections
    collating the statistics for a range of entries, with each individual
    statistic being easily identified, and the content of each statistic is
    self-describing

    :<header Accept: - :mimetype:`application/json`
                     - :mimetype:`text/plain`
    :>header Content-Type: - :mimetype:`application/json`
                           - :mimetype:`text/plain; charset=utf-8`
    :code 200: Request completed successfully

    **Request**:

    .. code-block:: http

        GET /_stats/couchdb/request_time HTTP/1.1
        Accept: application/json
        Host: localhost:5984

    **Response**:

    .. code-block:: http

        HTTP/1.1 200 OK
        Cache-Control: must-revalidate
        Content-Length: 187
        Content-Type: application/json
        Date: Sat, 10 Aug 2013 11:41:11 GMT
        Server: CouchDB (Erlang/OTP)

        {
            "couchdb": {
                "request_time": {
                    "current": 21.0,
                    "description": "length of a request inside CouchDB without MochiWeb",
                    "max": 19.0,
                    "mean": 7.0,
                    "min": 1.0,
                    "stddev": 10.392,
                    "sum": 21.0
                }
            }
        }

The fields provide the current, minimum and maximum, and a collection of
statistical means and quantities. The quantity in each case is not defined, but
the descriptions below provide

The statistics are divided into the following top-level sections:

``couchdb``
===========

Describes statistics specific to the internals of CouchDB

.. lint: ignore errors for the next 17 lines

+-------------------------+-------------------------------------------------------+----------------+
| Statistic ID            | Description                                           | Unit           |
+=========================+=======================================================+================+
| ``auth_cache_hits``     | Number of authentication cache hits                   | number         |
+-------------------------+-------------------------------------------------------+----------------+
| ``auth_cache_misses``   | Number of authentication cache misses                 | number         |
+-------------------------+-------------------------------------------------------+----------------+
| ``database_reads``      | Number of times a document was read from a database   | number         |
+-------------------------+-------------------------------------------------------+----------------+
| ``database_writes``     | Number of times a database was changed                | number         |
+-------------------------+-------------------------------------------------------+----------------+
| ``open_databases``      | Number of open databases                              | number         |
+-------------------------+-------------------------------------------------------+----------------+
| ``open_os_files``       | Number of file descriptors CouchDB has open           | number         |
+-------------------------+-------------------------------------------------------+----------------+
| ``request_time``        | Length of a request inside CouchDB without MochiWeb   | milliseconds   |
+-------------------------+-------------------------------------------------------+----------------+

``httpd_request_methods``
=========================

+----------------+----------------------------------+----------+
| Statistic ID   | Description                      | Unit     |
+================+==================================+==========+
| ``COPY``       | Number of HTTP COPY requests     | number   |
+----------------+----------------------------------+----------+
| ``DELETE``     | Number of HTTP DELETE requests   | number   |
+----------------+----------------------------------+----------+
| ``GET``        | Number of HTTP GET requests      | number   |
+----------------+----------------------------------+----------+
| ``HEAD``       | Number of HTTP HEAD requests     | number   |
+----------------+----------------------------------+----------+
| ``POST``       | Number of HTTP POST requests     | number   |
+----------------+----------------------------------+----------+
| ``PUT``        | Number of HTTP PUT requests      | number   |
+----------------+----------------------------------+----------+

``httpd_status_codes``
======================

.. lint: ignore errors for the next 29 lines

+----------------+------------------------------------------------------+----------+
| Statistic ID   | Description                                          | Unit     |
+================+======================================================+==========+
| ``200``        | Number of HTTP 200 OK responses                      | number   |
+----------------+------------------------------------------------------+----------+
| ``201``        | Number of HTTP 201 Created responses                 | number   |
+----------------+------------------------------------------------------+----------+
| ``202``        | Number of HTTP 202 Accepted responses                | number   |
+----------------+------------------------------------------------------+----------+
| ``301``        | Number of HTTP 301 Moved Permanently responses       | number   |
+----------------+------------------------------------------------------+----------+
| ``304``        | Number of HTTP 304 Not Modified responses            | number   |
+----------------+------------------------------------------------------+----------+
| ``400``        | Number of HTTP 400 Bad Request responses             | number   |
+----------------+------------------------------------------------------+----------+
| ``401``        | Number of HTTP 401 Unauthorized responses            | number   |
+----------------+------------------------------------------------------+----------+
| ``403``        | Number of HTTP 403 Forbidden responses               | number   |
+----------------+------------------------------------------------------+----------+
| ``404``        | Number of HTTP 404 Not Found responses               | number   |
+----------------+------------------------------------------------------+----------+
| ``405``        | Number of HTTP 405 Method Not Allowed responses      | number   |
+----------------+------------------------------------------------------+----------+
| ``409``        | Number of HTTP 409 Conflict responses                | number   |
+----------------+------------------------------------------------------+----------+
| ``412``        | Number of HTTP 412 Precondition Failed responses     | number   |
+----------------+------------------------------------------------------+----------+
| ``500``        | Number of HTTP 500 Internal Server Error responses   | number   |
+----------------+------------------------------------------------------+----------+

``httpd``
=========

.. lint: ignore errors for the next 13 lines

+----------------------------------+----------------------------------------------+----------+
| Statistic ID                     | Description                                  | Unit     |
+==================================+==============================================+==========+
| ``bulk_requests``                | Number of bulk requests                      | number   |
+----------------------------------+----------------------------------------------+----------+
| ``clients_requesting_changes``   | Number of clients for continuous _changes    | number   |
+----------------------------------+----------------------------------------------+----------+
| ``requests``                     | Number of HTTP requests                      | number   |
+----------------------------------+----------------------------------------------+----------+
| ``temporary_view_reads``         | Number of temporary view reads               | number   |
+----------------------------------+----------------------------------------------+----------+
| ``view_reads``                   | Number of view reads                         | number   |
+----------------------------------+----------------------------------------------+----------+

You can also access individual statistics by quoting the statistics sections
and statistic ID as part of the URL path. For example, to get the
``request_time`` statistics, you can use:

.. code-block:: http

    GET /_stats/couchdb/request_time HTTP/1.1

This returns an entire statistics object, as with the full request, but
containing only the request individual statistic. Hence, the returned structure
is as follows:

.. code-block:: javascript

    {
        "couchdb" : {
            "request_time" : {
                "stddev" : 7454.305,
                "min" : 1,
                "max" : 34185,
                "current" : 34697.803,
                "mean" : 1652.276,
                "sum" : 34697.803,
                "description" : "length of a request inside CouchDB without MochiWeb"
            }
        }
    }

.. _api/server/utils:

===========
``/_utils``
===========

.. http:get:: /_utils
    :synopsis: Redirects to /_utils/

    Accesses the built-in Fauxton administration interface for CouchDB.

    :>header Location: New URI location
    :code 301: Redirects to :get:`/_utils/`

.. http:get:: /_utils/
    :synopsis: CouchDB administration interface (Fauxton)

    :>header Content-Type: :mimetype:`text/html`
    :>header Last-Modified: Static files modification timestamp
    :code 200: Request completed successfully

.. _api/server/uuids:

===========
``/_uuids``
===========

.. versionchanged:: 2.0.0

.. http:get:: /_uuids
    :synopsis: Generates a list of UUIDs from the server

    Requests one or more Universally Unique Identifiers (UUIDs) from the
    CouchDB instance. The response is a JSON object providing a list of UUIDs.

    :<header Accept: - :mimetype:`application/json`
                     - :mimetype:`text/plain`
    :query number count: Number of UUIDs to return. Default is ``1``.
    :>header Content-Type: - :mimetype:`application/json`
                           - :mimetype:`text/plain; charset=utf-8`
    :>header ETag: Response hash
    :code 200: Request completed successfully
    :code 400: Requested more UUIDs than is :config:option:`allowed
               <uuids/max_count>` to retrieve

    **Request**:

    .. code-block:: http

        GET /_uuids?count=10 HTTP/1.1
        Accept: application/json
        Host: localhost:5984

    **Response**:

    .. code-block:: http

        HTTP/1.1 200 OK
        Content-Length: 362
        Content-Type: application/json
        Date: Sat, 10 Aug 2013 11:46:25 GMT
        ETag: "DGRWWQFLUDWN5MRKSLKQ425XV"
        Expires: Fri, 01 Jan 1990 00:00:00 GMT
        Pragma: no-cache
        Server: CouchDB (Erlang/OTP)

        {
            "uuids": [
                "75480ca477454894678e22eec6002413",
                "75480ca477454894678e22eec600250b",
                "75480ca477454894678e22eec6002c41",
                "75480ca477454894678e22eec6003b90",
                "75480ca477454894678e22eec6003fca",
                "75480ca477454894678e22eec6004bef",
                "75480ca477454894678e22eec600528f",
                "75480ca477454894678e22eec6005e0b",
                "75480ca477454894678e22eec6006158",
                "75480ca477454894678e22eec6006161"
            ]
        }

The UUID type is determined by the :config:option:`UUID algorithm
<uuids/algorithm>` setting in the CouchDB configuration.

The UUID type may be changed at any time through the
:ref:`Configuration API <api/config/section/key>`. For example, the UUID type
could be changed to ``random`` by sending this HTTP request:

.. code-block:: http

    PUT http://couchdb:5984/_node/nonode@nohost/_config/uuids/algorithm HTTP/1.1
    Content-Type: application/json
    Accept: */*

    "random"

You can verify the change by obtaining a list of UUIDs:

.. code-block:: javascript

    {
        "uuids" : [
            "031aad7b469956cf2826fcb2a9260492",
            "6ec875e15e6b385120938df18ee8e496",
            "cff9e881516483911aa2f0e98949092d",
            "b89d37509d39dd712546f9510d4a9271",
            "2e0dbf7f6c4ad716f21938a016e4e59f"
        ]
    }

.. _api/server/favicon:

================
``/favicon.ico``
================

.. http:get:: /favicon.ico
    :synopsis: Returns the site icon

    Binary content for the `favicon.ico` site icon.

    :>header Content-Type: :mimetype:`image/x-icon`
    :code 200: Request completed successfully
    :code 404: The requested content could not be found