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POnginx: Is it possible to capture response headers in access log when using nginx as a reverse proxy?
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copied!<p>We are using nginx as a reverse proxy to control and log access to a Clojure (Java) web service application.</p> <p>We are able to generate an <code>access_log</code> and capture incoming headers using nginx just fine. Our Clojure app logs activity via log4j. Trouble is, is that we can't match an entry in the <code>access_log</code> to an entry generated by the app.</p> <p>The app responds to access by sending response headers as well as a body. We can freely change these response headers. My initial thought was to generate a UUID that corresponds to each and every web service request and send that back to the user within the reply header <code>X-Uuid</code>. My thought was that I could capture this response by creating a custom <code>log_format</code>:</p> <pre><code>log_format lt-custom '$remote_addr - $remote_user [$time_local] ' '"$request" $status $body_bytes_sent ' '"$http_referer" "$http_user_agent" $request_time $http_x_uuid'; </code></pre> <p>It's looking like nginx can capture headers in incoming requests but not outgoing replies (I verified this by replacing <code>$http_x_uuid</code> with <code>$http_content_type</code>).</p> <p>So! Is there a way I can tie my <code>access_log</code> enties and my log4j entries by capturing outgoing reply headers using nginx? Is there a better way? I'd rather not have to rely on users generating their own UUIDs.</p> <p>Thanks so much!</p>

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