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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 9a0849fd4b46
children 707736510a90
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types {
    text/html                                        html htm shtml;
    text/css                                         css;
    text/xml                                         xml;
    image/gif                                        gif;
    image/jpeg                                       jpeg jpg;
    application/javascript                           js;
    application/atom+xml                             atom;
    application/rss+xml                              rss;

    text/mathml                                      mml;
    text/plain                                       txt;
    text/vnd.sun.j2me.app-descriptor                 jad;
    text/vnd.wap.wml                                 wml;
    text/x-component                                 htc;

    image/avif                                       avif;
    image/bmp                                        bmp;
    image/png                                        png;
    image/svg+xml                                    svg svgz;
    image/tiff                                       tif tiff;
    image/vnd.wap.wbmp                               wbmp;
    image/webp                                       webp;
    image/x-icon                                     ico;
    image/x-jng                                      jng;

    font/woff                                        woff;
    font/woff2                                       woff2;

    application/java-archive                         jar war ear;
    application/json                                 json;
    application/mac-binhex40                         hqx;
    application/msword                               doc;
    application/pdf                                  pdf;
    application/postscript                           ps eps ai;
    application/rtf                                  rtf;
    application/vnd.apple.mpegurl                    m3u8;
    application/vnd.debian.binary-package            deb udeb;
    application/vnd.google-earth.kml+xml             kml;
    application/vnd.google-earth.kmz                 kmz;
    application/vnd.ms-excel                         xls;
    application/vnd.ms-fontobject                    eot;
    application/vnd.ms-powerpoint                    ppt;
    application/vnd.oasis.opendocument.graphics      odg;
    application/vnd.oasis.opendocument.presentation  odp;
    application/vnd.oasis.opendocument.spreadsheet   ods;
    application/vnd.oasis.opendocument.text          odt;
    application/vnd.openxmlformats-officedocument.presentationml.presentation
                                                     pptx;
    application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
                                                     xlsx;
    application/vnd.openxmlformats-officedocument.wordprocessingml.document
                                                     docx;
    application/vnd.rar                              rar;
    application/vnd.wap.wmlc                         wmlc;
    application/wasm                                 wasm;
    application/x-7z-compressed                      7z;
    application/x-cocoa                              cco;
    application/x-java-archive-diff                  jardiff;
    application/x-java-jnlp-file                     jnlp;
    application/x-makeself                           run;
    application/x-perl                               pl pm;
    application/x-pilot                              prc pdb;
    application/x-redhat-package-manager             rpm;
    application/x-sea                                sea;
    application/x-shockwave-flash                    swf;
    application/x-stuffit                            sit;
    application/x-tcl                                tcl tk;
    application/x-x509-ca-cert                       der pem crt;
    application/x-xpinstall                          xpi;
    application/xhtml+xml                            xhtml;
    application/xspf+xml                             xspf;
    application/zip                                  zip;

    application/octet-stream                         bin exe dll;
    application/octet-stream                         dmg;
    application/octet-stream                         iso img;
    application/octet-stream                         msi msp msm;

    audio/midi                                       mid midi kar;
    audio/mpeg                                       mp3;
    audio/ogg                                        ogg;
    audio/x-m4a                                      m4a;
    audio/x-realaudio                                ra;

    video/3gpp                                       3gpp 3gp;
    video/mp2t                                       ts;
    video/mp4                                        mp4;
    video/mpeg                                       mpeg mpg;
    video/quicktime                                  mov;
    video/webm                                       webm;
    video/x-flv                                      flv;
    video/x-m4v                                      m4v;
    video/x-mng                                      mng;
    video/x-ms-asf                                   asx asf;
    video/x-ms-wmv                                   wmv;
    video/x-msvideo                                  avi;
}