如何更改 nginx 中代理服务器响应的状态代码? [英] How to change the status code of a proxied server response in nginx?

问题描述

我很难将 nginx 配置为充当公共 S3 端点的代理.我的用例需要更改 S3 响应的状态代码，同时保留响应负载.

I'm having a hard time configuring nginx to act as a proxy of a public S3 endpoint. My use case necessitates altering the status code of the S3 response, while preserving the response payload.

S3 返回的可能状态代码包括 200 和 403.对于我的用例，我需要将这些状态代码映射到 503.

The possible status codes returned by S3 include 200 and 403. For my use case, I need to map those status codes to 503.

我尝试了以下不起作用的方法:

I have tried the following which does not work:

location ~* ^/.* {
  [...]
  proxy_intercept_errors on;
  error_page             200 =503 $upstream_http_location
}

Nginx 输出如下错误:

Nginx outputs the following error:

nginx: [emerg] 值200"必须在/etc/nginx/nginx.conf:xx 中的 300 到 599 之间

nginx: [emerg] value "200" must be between 300 and 599 in /etc/nginx/nginx.conf:xx

这是一个更完整的片段:

Here's a more complete snippet:

server {
  listen       80;

  location ~* ^/.* {
    proxy_http_version         1.1;
    proxy_method               GET;
    proxy_pass                 http://my-s3-bucket-endpoint;
    proxy_pass_request_body    off;

    proxy_set_header       Content-Length "";
    proxy_set_header       Connection "";
    proxy_set_header       Host my-s3-bucket-endpoint;
    proxy_set_header       Authorization '';

    proxy_hide_header      x-amz-id-2;
    proxy_hide_header      x-amz-request-id;
    proxy_hide_header      Set-Cookie;
    proxy_ignore_headers   "Set-Cookie";

    proxy_cache            S3_CACHE;
    proxy_cache_valid      200 403 503 1h;
    proxy_cache_bypass     $http_cache_purge;
    add_header             X-Cached $upstream_cache_status;

    proxy_intercept_errors on;
    error_page             200 =503 $upstream_http_location;
  }
}

是否可以通过 nginx 实现我所需要的?

Is it possible to achieve what I need with nginx?

推荐答案

我找到了一个或多或少合适的解决方案.这有点骇人听闻，但确实有效.

I found a more or less suitable solution. It's a bit hackish but it works.

关键是将我的 S3 存储桶的索引文档设置为不存在的文件名.这会导致对 S3 存储桶端点的/请求导致 403.

The key was to set the index document of my S3 bucket to a non-existing filename. This causes requests to / on the S3 bucket endpoint to result in 403.

由于 nginx 代理将所有传入请求映射到 S3 存储桶端点上的/，因此结果始终是 403，nginx 代理可以拦截.从那里，error_page 指令告诉它通过请求 S3 存储桶端点中的特定文档(在本例中为 error.json)来响应，并使用 503 作为响应状态代码.

Since the nginx proxy maps all incoming requests to / on the S3 bucket endpoint, the result is always 403 which the nginx proxy can intercept. From there, the error_page directive tells it to respond by requesting a specific document (in this case error.json) in the S3 bucket endpoint and use 503 as the response status code.

location ~* ^/. {
  proxy_intercept_errors on;
  error_page             403 =503 /error.json;
}

此解决方案涉及将两个请求发送到 S3 存储桶端点(/、/error.json)，但至少似乎使用上面更完整片段中的配置为这两个请求启用了缓存.

This solution involves two requests being sent to the S3 bucket endpoint (/, /error.json) but at least caching seems to be enabled for both requests using the configuration in the more complete snippet above.

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