对于大型请求正文，将忽略Nginx proxy_cache_key $ request_body [英] Nginx proxy_cache_key $request_body is ignored for large request body

问题描述

我使用nginx作为反向代理，我希望它能够缓存POST请求。我的后端已正确配置为POST请求返回适当的缓存控制头。在nginx中我配置了：

I use nginx as a reverse proxy and I would like it to cache POST requests. My back-end is correctly configured to return appropriate cache-control headers for POST requests. In nginx I have configured:

proxy_cache_methods POST;
proxy_cache_key "$request_method$request_uri$request_body";

这适用于小型HTTP POST请求。但是我开始注意到对于大型请求（例如文件上传），似乎 $ request_cache_key 中忽略了 $ request_body 。当包含文件上载的表单使用完全不同的数据提交两次时，nginx将返回缓存的结果。

This works great for small HTTP POST requests. However I started noticing that for large requests (e.g. file uploads) it seems like the $request_body is ignored in the proxy_cache_key. When a form containing a file upload is submitted twice with completely different data, nginx will return the cached result.

可能导致这种情况的原因是什么？如何在<$ c $中配置nginx以使用 $ request_body （或 $ request_body 的哈希值） c> proxy_cache_key 即使是大型POST请求？

What could cause this? How can I configure nginx to use the $request_body (or a hash of $request_body) in the proxy_cache_key even for large POST requests?

推荐答案

事实证明，当<$ c时$ c> $ content_length> client_body_buffer_size ，
然后将请求正文写入文件，变量 $ request_body ==。

另见 http://mailman.nginx.org/ pipermail / nginx / 2013-September / 040442.html

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