proxy_pass_request_headers off的坑

举个例子，客户端访问80端口，服务器需要将请求转发至8080端口处理，

我们希望将客户端传递的headers过滤，再设置内部转发请求header（test:"123"），

坑（通过ngx.req.set_header设置的请求头，会被过滤）：

server {
listen 80;

location / {
content_by_lua '
ngx.req.set_header("test", "123")
local response = ngx.location.capture("/upstream",
{
method = ngx.HTTP_GET,
vars = {
my_uri = "/hello",
},
body = "",
}
)
ngx.exit(200)
';
}

location /upstream {
set $my_uri $my_uri;
proxy_pass_request_headers off;
proxy_pass http://127.0.0.1:8080$my_uri; }
}

server {
listen 8080;
location /hello {
content_by_lua '
for k, v in pairs(ngx.req.get_headers()) do
ngx.log(ngx.ERR, "###: " .. k .. " : " .. v)
end
';
}
}

正确做法（传递header，重新设置）：

server {
listen 80;

location / {
content_by_lua '
local response = ngx.location.capture("/upstream",
{
method = ngx.HTTP_GET,
vars = {
my_uri = "/hello",
my_test = "123",
},
body = "",
}
)
ngx.exit(200)
';
}

location /upstream {
set $my_uri $my_uri;
set $my_test $my_test;
proxy_pass_request_headers off;
proxy_set_header test $my_test;
proxy_pass http://127.0.0.1:8080$my_uri; }
}

server {
listen 8080;
location /hello {
content_by_lua '
for k, v in pairs(ngx.req.get_headers()) do
ngx.log(ngx.ERR, "###: " .. k .. " : " .. v)
end
';
}

}

原文出自：http://blog.csdn.net/daiyudong2020/article/details/78572442

End；