Nginx proxy_set_header 默认会覆盖上一层的设置

#!/usr/bin/env python

import json

from flask import Flask, request

app = Flask(__name__)

@app.route('/')
def index():
    return json.dumps(dict(request.headers))

upstream flask {
    server localhost:8060;
}

server {
    listen 80;
    server_name "www.qae.com";

    # 使用 curl 请求后端，后端能收到的 "HH2" "HH3", 无法收到 HH0, HH1 header
    proxy_set_header HH0 "value";
    proxy_set_header HH1 "value";

    location / {
        # 当子块中有 proxy_set_header 指令时，父块中所有的 proxy_set_header 的值都会被丢弃
        # include 不会创建新的块，所以 include 的配置文件中的 proxy_set_header 还能会正常使用的
        proxy_set_header HH2 "value";
        proxy_set_header HHCOMMON "value2";
        include conf.d/flask-component.conf;
        proxy_pass http://flask;
    }
}

proxy_set_header HH3 "value";
# 同一个块中多次使用 proxy_set_header 定义 HHCOMMON, 他们的值会用 `,` join 到一起
proxy_set_header HHCOMMON "value3";

ø> curl -s www.qae.com | jq
{
  "Hh3": "value",
  "Hhcommon": "value3,value2",
  "Hh2": "value",
  "Host": "flask",
  "Connection": "close",
  "User-Agent": "curl/7.81.0",
  "Accept": "*/*"
}