request help: The response head was strangely modified after passing APISIX

[StretchV]

Issue description

我通过修改本地的hosts对路由在postman上分别做了测试，一种是通过apisix，一种是直接访问后端的ip地址，结果是通过apisix后响应头被不知道什么原因的修改了，下面是不过apisix和过apisix的两种情况

这是后端往响应头上加头信息的代码：

没有开任何的插件，service配的也是穿透模式，不太明白为什么会这样。。

Environment

• apisix version (cmd: apisix version):apache/apisix:2.3-alpine

[tzssangglass]

adding Server header to the response header is a default behavior, indicating that the request is handled by APISIX， but overriding Access-Control-Allow-Headers is a problem, what are your upstream services?

[StretchV]

upstream services is ingress-controller ，I can get the head if I bypass APISIX and visit the upstream

[tzssangglass]

upstream services is ingress-controller ，I can get the head if I bypass APISIX and visit the upstream

what is the value of Access-Control-Allow-Headers in the request header?

[StretchV]

这3个是用来cors跨越名访问用的， 还有我之前也有往头里加cache-control: no-cache（清除浏览器缓存）这个过完apisix后也不见了

[Firstsawyou]

This information seems to be carried with the cors plugin enabled. You check if the cors plugin is enabled.

[StretchV]

是的 谢谢 确实有个全局插件cors!
目前我已经去掉了,而且保证了没有全局插件存在了,但是目前还是有那个响应头丢失的情况存在

过apisix后cache-control: no-cache没有了..

[StretchV]

经过测试需要加上插件proxy-cache，并设置hide_cache_headers：false 才能返回给客户端，但是我不太明白为什么会这样呢，这个插件是必须要加的吗？

[Firstsawyou]

The proxy-cache plugin is not necessary, you can provide route related configuration data, I will check it.

[StretchV]

{
"create_time": 1620454728,
"update_time": 1620454728,
"uris": [
"/bff-message-center",
"/bff-message-center/*"
],
"name": "gateway-test_XXXXXX___bff-message-XXXXXX",
"methods": [
"GET",
"HEAD",
"POST",
"PUT",
"DELETE",
"OPTIONS",
"PATCH"
],
"hosts": [
"gateway-test.XXXXXX"
],
"service_id": "347097464416764780",
"enable_websocket": true,
"status": 1
}
这是这个路由配置， service上只开了prometheus插件

[spacewander]

@StretchV
the issue is fixed by #3789 in v2.5?

[Firstsawyou]

I confirmed that it has been resolved in APISIX 2.5

[StretchV]

那我可以先用proxy-cache这个插件配置hide_cache_headers：false 这种方式解决吗,会有什么影响吗,我目前吧这个插件配成全局插件了,我的是2.3版本

[spacewander]

那我可以先用proxy-cache这个插件配置hide_cache_headers：false 这种方式解决吗,会有什么影响吗,我目前吧这个插件配成全局插件了,我的是2.3版本

This solution looks good to me. If possible, please upgrade to 2.5.

[spacewander]

Consider solved by #3789