Question

问题陈述

我想基于请求标头中的某个值将proxy_pass转换为另一个url。所有请求详细信息，包括查询参数（如果有），标题和所有内容都应传递给代理地址。

我尝试了什么

我已经关注SO post并根据提到的要求我尝试了以下内容。

Test.lua文件

local token = ngx.var.http_Authorization
if token == "hello"
then 
-- ngx.print ("hello")
local res = ngx.location.capture("/someURL") 
if res.status == 200
then ngx.print(res.body)
end
end

nginx.conf

location /api/employees {
        content_by_lua_file test.lua;
}
location /someURL {
    internal;
    proxy_pass http://productionURL?q1=123&name=xyz;
    #proxy_redirect default;
}

如您所见，我在proxy_pass语句中手动传递查询参数。

如何通过在proxy_pass期间不传递实际request来解决此问题？

Answer 1

根据标题重写原始请求，可以轻松解决您的问题。这是一个例子：

#sample backend
set $backend_host "http://httpbin.org";

location ~*/api/employees {
        rewrite_by_lua '
             --reading request headers
             local req_headers = ngx.req.get_headers()
             local target_uri  = ""
             -- checking an a header value to determine target uri
             if req_headers["x-special-header"] then
                target_uri = req_headers["x-special-header"]
             else 
                -- default path if not header found
                target_uri = "/get"
             end 
            ngx.log(ngx.NOTICE, string.format("resolved target_uri: %s", target_uri))
            --rewriting uri according to header (all original req args and headers are preserved)
            ngx.req.set_uri(target_uri)
        ';
        proxy_pass $backend_host;
}

示例请求发送'special'标头作为目标后端的路径：

curl 'http://localhost/api/employees?arg1=val1&arg2=val2' -H 'x-special-header: /headers'

回应：

    {
  "headers": {
    "Accept": "*/*",
    "Connect-Time": "0",
    "Connection": "close",
    "Host": "httpbin.org",
    "Total-Route-Time": "0",
    "User-Agent": "curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.14.0.0 zlib/1.2.3 libidn/1.18 libssh2/1.4.2",
    "Via": "1.1 vegur",
    "X-Request-Id": "6e515e0a-0061-4576-b1aa-5da3e3308c81",
    "X-Special-Header": "/headers"
  }

示例请求没有'特殊'标题：

curl 'http://localhost/api/employees?arg1=val1&arg2=val2'

回应：

{
  "args": {
    "arg1": "val1",
    "arg2": "val2"
  },
  "headers": {
    "Accept": "*/*",
    "Connect-Time": "4",
    "Connection": "close",
    "Host": "httpbin.org",
    "Total-Route-Time": "0",
    "User-Agent": "curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.14.0.0 zlib/1.2.3 libidn/1.18 libssh2/1.4.2",
    "Via": "1.1 vegur",
    "X-Request-Id": "520c0e12-1361-4c78-8bdf-1bff3f9d924c"
  },
  "url": "http://httpbin.org/get?arg1=val1&arg2=val2"
}

NGINX proxy_pass基于if-else条件

1 个答案: