原文(source): 高飛鳥 – Highbird » limitrequestfieldsize
nginx默認的header長度上限是4k，如果超過了這個值
nginx會直接返回400錯誤
[error] 16613#0: *105 upstream sent too big header while reading response header from upstream
Apache:
Error 400
Your browser sent a request that this server could not understand.
Size of a request header field exceeds server limit.