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Request body: error_page 413 handling with HTTP/2 and HTTP/3. When the client_max_body_size limit in ngx_http_core_find_config_phase() is hit, nginx calls the ngx_http_discard_request_body() function, which normally sets the r->discard_body flag while discarding the body, and then reduces the r->headers_in.content_length_n field to 0 when the body is completely discarded. As such, the client_max_body_size check is skipped if the request is redirected to an error page, and this makes it possible to use "error_page 413" without additional settings. This only works with HTTP/1.x though. The HTTP/2 and HTTP/3 request body discarding code paths failed to set r->discard_body or reset r->headers_in.content_length_n, so configuring "error_page 413" did notwork without additionally clearing the client_max_body_size limit in the location with error page. Fix is to set r->headers_in.content_length_n to 0 in the HTTP/2 and HTTP/3 request body discarding code paths (if there is a body). This is essentially what happens with HTTP/1.x when the body is completely discarded, and makes it possible to use "error_page 413" with HTTP/2 and HTTP/3 without additional settings. Additionally, r->discard_body flag is also set. For HTTP/2, it is not needed, but serves as an optimization. For HTTP/3, it ensures that the request body cannot be read after it was discarded, thus bypassing the client_max_body_size limit. Further, the r->discard_body flag is now always set after the request body is discarded (and not cleared once it is fully discarded). While the body is being discarded, the new r->discarding_body flag is now used. This slightly optimizes existing code paths in ngx_http_read_client_request_body() and ngx_http_discard_request_body(), and also makes it easier to only set ngx_http_discarded_request_body_handler() for HTTP/1.x.
author Maxim Dounin <mdounin@mdounin.ru>
date Sat, 27 Apr 2024 18:22:38 +0300
parents 985b0bda403c
children
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<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://freenginx.org/">freenginx.org</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>