go config_error ai_generated true

error: http: request header too large

ID: go/net-http-request-header-too-large

Also available as: JSON · Markdown · 中文
80%Fix Rate
83%Confidence
0Evidence
2025-01-10First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
1.20 active — — —
1.21 active — — —

Root Cause

The HTTP request headers exceed the server's maximum header size limit, typically 1MB by default.

generic

中文

HTTP请求头超过服务器的最大头大小限制，默认通常为1MB。

Workarounds

  1. 95% success Set a reasonable MaxHeaderBytes on the server 
    server := &http.Server{
    Addr: ":8080",
    MaxHeaderBytes: 1 << 20, // 1 MB
}

Dead Ends

Common approaches that don't work:

  1. Increasing server MaxHeaderBytes arbitrarily 40% fail

    May allow denial-of-service attacks; better to reduce header size.