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                        <h1 id="request-log-format"><a class="header" href="#request-log-format">Request log format</a></h1>
<p>HTTP request logs are written by synapse (see <a href="../synapse/http/site.py"><code>site.py</code></a> for details).</p>
<p>See the following for how to decode the dense data available from the default logging configuration.</p>
<pre><code>2020-10-01 12:00:00,000 - synapse.access.http.8008 - 311 - INFO - PUT-1000- 192.168.0.1 - 8008 - {another-matrix-server.com} Processed request: 0.100sec/-0.000sec (0.000sec, 0.000sec) (0.001sec/0.090sec/3) 11B !200 &quot;PUT /_matrix/federation/v1/send/1600000000000 HTTP/1.1&quot; &quot;Synapse/1.20.1&quot; [0 dbevts]
-AAAAAAAAAAAAAAAAAAAAA-   -BBBBBBBBBBBBBBBBBBBBBB-   -C-   -DD-   -EEEEEE-  -FFFFFFFFF-   -GG-    -HHHHHHHHHHHHHHHHHHHHHHH-                     -IIIIII- -JJJJJJJ-  -KKKKKK-, -LLLLLL-  -MMMMMMM- -NNNNNN- O  -P- -QQ-  -RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR-   -SSSSSSSSSSSS-   -TTTTTT-
</code></pre>
<table><thead><tr><th>Part</th><th>Explanation</th></tr></thead><tbody>
<tr><td>AAAA</td><td>Timestamp request was logged (not recieved)</td></tr>
<tr><td>BBBB</td><td>Logger name (<code>synapse.access.(http\|https).&lt;tag&gt;</code>, where 'tag' is defined in the <code>listeners</code> config section, normally the port)</td></tr>
<tr><td>CCCC</td><td>Line number in code</td></tr>
<tr><td>DDDD</td><td>Log Level</td></tr>
<tr><td>EEEE</td><td>Request Identifier (This identifier is shared by related log lines)</td></tr>
<tr><td>FFFF</td><td>Source IP (Or X-Forwarded-For if enabled)</td></tr>
<tr><td>GGGG</td><td>Server Port</td></tr>
<tr><td>HHHH</td><td>Federated Server or Local User making request (blank if unauthenticated or not supplied)</td></tr>
<tr><td>IIII</td><td>Total Time to process the request</td></tr>
<tr><td>JJJJ</td><td>Time to send response over network once generated (this may be negative if the socket is closed before the response is generated)</td></tr>
<tr><td>KKKK</td><td>Userland CPU time</td></tr>
<tr><td>LLLL</td><td>System CPU time</td></tr>
<tr><td>MMMM</td><td>Total time waiting for a free DB connection from the pool across all parallel DB work from this request</td></tr>
<tr><td>NNNN</td><td>Total time waiting for response to DB queries across all parallel DB work from this request</td></tr>
<tr><td>OOOO</td><td>Count of DB transactions performed</td></tr>
<tr><td>PPPP</td><td>Response body size</td></tr>
<tr><td>QQQQ</td><td>Response status code<br/>Suffixed with <code>!</code> if the socket was closed before the response was generated.<br/>A <code>499!</code> status code indicates that Synapse also cancelled request processing after the socket was closed.<br/></td></tr>
<tr><td>RRRR</td><td>Request</td></tr>
<tr><td>SSSS</td><td>User-agent</td></tr>
<tr><td>TTTT</td><td>Events fetched from DB to service this request (note that this does not include events fetched from the cache)</td></tr>
</tbody></table>
<p>MMMM / NNNN can be greater than IIII if there are multiple slow database queries
running in parallel.</p>
<p>Some actions can result in multiple identical http requests, which will return
the same data, but only the first request will report time/transactions in
<code>KKKK</code>/<code>LLLL</code>/<code>MMMM</code>/<code>NNNN</code>/<code>OOOO</code> - the others will be awaiting the first query to return a
response and will simultaneously return with the first request, but with very
small processing times.</p>

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