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nginx 是否允许上游服务器在请求完成之前响应并关闭请求？

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nginx 是否允许上游服务器在请求完成之前响应并关闭请求？

我有一个 nginx 代理请求的图片上传服务。一切运行良好。但有时，服务器已经有用户正在上传的图片。因此，我想尽早响应并关闭连接。

在读取标头并与服务器检查后，我调用 Node 的response.end（[数据][, 编码][, 回调]）。

Nginx 崩溃并返回空白响应：

[error] 3831#0: *12879 readv() failed (104: Connection reset by peer) while reading upstream

我的猜测是，nginx 认为上游服务器发生了一些不好的事情，立即断开客户端连接而不发送上游服务器的响应。

有人知道当 nginx 作为代理时如何正确响应和关闭客户端的连接吗？我知道这是可以做到的：参见：在请求之前发送响应

这是 nginx conf 文件：

worker_processes 8; # the number of processors
worker_rlimit_nofile 128; # each connection needs 2 file handles

events {
  worker_connections 128; # two connections per end-user connection (proxy)
  multi_accept on;
  use kqueue;
}

http {
  sendfile on;
  tcp_nopush on; # attempt to send HTTP response head in one packet
  tcp_nodelay off; # Nagle algorithm, wait until we have the maximum amount of data the network can send at once
  keepalive_timeout 65s;

  include nginx.mime.types;
  default_type application/octet-stream;

  error_log /usr/local/var/log/nginx/error.log;
  log_format main '$remote_addr - $remote_user [$time_local] '
                    '"$request" $status $body_bytes_sent "$http_referer" '
                    '"$http_user_agent" "$http_x_forwarded_for"';

  gzip off;

}

upstream upload_service {
  server 127.0.0.1:1337 fail_timeout=0;
  keepalive 64;
}

location /api/upload_service/ {
  # setup proxy to UpNode
  proxy_set_header X-Real-IP $remote_addr;
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  proxy_set_header X-Forwarded-Proto $scheme;
  proxy_set_header Host $http_host;
  proxy_set_header X-NginX-Proxy true;
  proxy_set_header Connection "";
  proxy_pass http://upload_service;

  # The timeout is set only between two successive read operations
  proxy_read_timeout 500s;
  # timeout for reading client request body, only for a period between two successive read   operations
  client_body_timeout 30s;
  # maximum allowed size of the client request body, specified in the "Content-Length"
  client_max_body_size 64M;
}

答案1

您没有提到您的客户端是什么，但是，这听起来像是使用 expect 标头可以实现的功能。本质上，客户端设置一个带有“100-continue”期望的“Expect”标头。然后，客户端等待服务器的 100 Continue 响应，然后再发送其请求主体。

如果服务器不想接收主体，它可以用最终状态进行响应，并且客户端不会发送主体。

该过程定义在RFC2616，第 8.2.3 节

答案2

https://forum.nginx.org/read.php?2,254918,254918#msg-254918提到RFC2616，8.2.2也相关：

根据 RFC2616，8.2.21如果请求包含 Content-Length 并且客户端（本例中为 nginx）由于错误响应而停止传输主体，则客户端（nginx）必须关闭连接

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