nginx
config_error
ai_generated
true
上游在读取响应头时发送了过大的头
upstream sent too big header while reading response header from upstream
ID: nginx/upstream-sent-too-big-header-while-reading-response-header
85%修复率
87%置信度
1证据数
2023-08-15首次发现
版本兼容性
| 版本 | 状态 | 引入 | 弃用 | 备注 |
|---|---|---|---|---|
| nginx 1.18.0 | active | — | — | — |
| nginx 1.20.2 | active | — | — | — |
| nginx 1.22.1 | active | — | — | — |
| nginx 1.24.0 | active | — | — | — |
| nginx 1.25.3 | active | — | — | — |
根因分析
上游服务器发送的HTTP响应头超过了proxy_buffer_size或large_client_header_buffers的限制，通常由大型cookie或自定义头引起。
English
The upstream server sends HTTP response headers that exceed the proxy_buffer_size or large_client_header_buffers limit, often due to large cookies or custom headers.
官方文档
http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_buffer_size解决方案
-
在location块中将proxy_buffer_size增加到8k或更大：proxy_buffer_size 8k; proxy_buffers 8 8k;
-
优化上游应用以减少头部大小，例如限制cookie大小或移除不必要的自定义头部
-
作为最后手段关闭proxy_buffering：proxy_buffering off;（增加内存但绕过缓冲区限制）
无效尝试
常见但无效的做法:
-
70% 失败
proxy_buffer_size must be increased in the server/location context; also proxy_buffers number may need adjustment.
-
90% 失败
This controls client headers, not upstream response headers; it's irrelevant.
-
95% 失败
The issue is on the upstream server side, not client side; cache clearing doesn't help.