Github user kxepal commented on the pull request:

    https://github.com/apache/couchdb-chttpd/pull/111#issuecomment-206931507
  
    @rnewson Everywhere all the time:
    
    ```
    $ echo '{"foo":4}' | http put http://localhost:15984/db/test
    HTTP/1.1 201 Created
    Cache-Control: must-revalidate
    Content-Length: 67
    Content-Type: application/json
    Date: Thu, 07 Apr 2016 14:13:26 GMT
    Etag: "1-80d7ea9795ad67ad0e7a1e567c15314e"
    Location: http://localhost:15984/db/test
    Server: CouchDB/fc9acc2 (Erlang OTP/17)
    X-Couch-Request-ID: 13cab4abd5
    X-CouchDB-Body-Time: 0
    
    {
        "id": "test",
        "ok": true,
        "rev": "1-80d7ea9795ad67ad0e7a1e567c15314e"
    }
    ```
    
    ```
    $ echo '{"foo":4, "_rev": "1-ABC"}' | http put 
http://localhost:15984/db/test?new_edits=false
    HTTP/1.1 201 Created
    Cache-Control: must-revalidate
    Content-Length: 38
    Content-Type: application/json
    Date: Thu, 07 Apr 2016 14:13:39 GMT
    Etag: "1-ABC"
    Location: http://localhost:15984/db/test
    Server: CouchDB/fc9acc2 (Erlang OTP/17)
    X-Couch-Request-ID: 2c37ce6ed3
    X-CouchDB-Body-Time: 0
    
    {
        "id": "test",
        "ok": true,
        "rev": "1-ABC"
    }
    ```
    
    Also [from 
docs](http://docs.couchdb.org/en/latest/api/document/common.html#head--db-docid).
 And many entries in wiki I'm lazy to search for. That's an old feature that 
simplifies caching without adding some new entity to remember.



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