node.js - Nginx gunzip POST 请求到后端

Question

我有大量的 HTTP POST 请求被发送到 nginx 服务器，然后负载平衡到一组反向代理的 node.js/express.js 后端服务器。为了节省一些网络消耗，使用 GZIP 和 header Content-Encoding: gzip 发送有效负载。

我正在努力实现这样的目标:

[Client] [Nginx Reverse Proxy] [BackEnd]
| [gziped payload] | [raw payload] |<br/>
|--------------------> | ----------------------------->|
| | |<br/>
| [Raw Response] | [Raw response] |
| <------------------ | <-----------------------------|
| | |


出于效率原因，我想在 Nginx 上运行 Gunzip，但我一直无法这样做。这是 http nginx.conf 文件:

http {
    include       mime.types;
    default_type  application/octet-stream;
    sendfile        on;
    keepalive_timeout  65;

    server {
        listen       80;
        server_name  localhost;
        gunzip on;
        location / {
           proxy_pass http://localhost:8080;
           proxy_http_version 1.1;
           proxy_set_header Upgrade $http_upgrade;
           proxy_set_header Connection 'upgrade';
           proxy_set_header Host $host;
           proxy_cache_bypass $http_upgrade;
          }
    }
}

这是一个请求示例:

echo "{"id": 0,"mypayload":"This is an example"}" | gzip -c - | curl -v -i -X POST -H 'Content-Encoding: gzip' --data-binary '@-' http://localhost/test

我希望 nginx 解压缩有效负载的内容并将原始内容传送到后端服务器，但内容仍以压缩形式传送。

我见过很多人在做相反的事情(Nginx gziping 响应，甚至对没有 Accept-Encoding: gzip header 的客户端的 gunzip 响应)却找不到它成功地将 payload gunziping 到后端。

有什么线索吗？

Answer 1

我知道这是一个较旧的问题，但我希望对发送压缩请求的 IOS 客户端执行相同的操作，在查看您的问题后，我发现了一个描述为 here 的 lua 解决方案。并想将其张贴在这里以供将来引用。

lua 模块看起来像:

-- Debian packages nginx-extras, lua-zlib required

ngx.ctx.max_chunk_size = tonumber(ngx.var.max_chunk_size)
ngx.ctx.max_body_size = tonumber(ngx.var.max_body_size)

function create_error_response (code, description)
    local message = string.format('{"status":400,"statusReason":"Bad Request","code":%d,"exception":"","description":"%s","message":"HTTP 400 Bad Request"}', code, description)
    ngx.status = ngx.HTTP_BAD_REQUEST
    ngx.header.content_type = "application/json"
    ngx.say(message)
    ngx.exit(ngx.HTTP_OK)
end


function inflate_chunk (stream, chunk)
    return stream(chunk)
end


function inflate_body (data)
    local stream = require("zlib").inflate()
    local buffer = ""
    local chunk = ""

    for index = 0, data:len(), ngx.ctx.max_chunk_size do
        chunk = string.sub(data, index, index + ngx.ctx.max_chunk_size - 1)
        local status, output, eof, bytes_in, bytes_out = pcall(stream, chunk)

        if not status then
            -- corrupted chunk
            ngx.log(ngx.ERR, output)
            create_error_response(4001, "Corrupted GZIP body")
        end

        if bytes_in == 0 and bytes_out == 0 then
            -- body is not gzip compressed
            create_error_response(4002, "Invalid GZIP body")
        end

        buffer = buffer .. output

        if bytes_out > ngx.ctx.max_body_size then
            -- uncompressed body too large
            create_error_response(4003, "Uncompressed body too large")
        end
    end

    return buffer
end


local content_encoding = ngx.req.get_headers()["Content-Encoding"]
if content_encoding == "gzip" then
    ngx.req.read_body()
    local data = ngx.req.get_body_data()

    if data ~= '' then
        local new_data = inflate_body(data)

        ngx.req.clear_header("Content-Encoding")
        ngx.req.clear_header("Content-Length")
        ngx.req.set_body_data(new_data)
    end
end

然后你可以像这样使用它:

location / {
        proxy_pass http://127.0.0.1:8080;
        proxy_pass_request_headers on;
        proxy_redirect off;
        proxy_set_header X-Real-IP $remote_addr;

        client_max_body_size 512k;    # Max request body size of 512 KB
        client_body_buffer_size 512k;

        set $max_chunk_size = 10240;  # Chunks of 10 KB
        set $max_body_size = 524288;  # Max inflated body size of 512 KB

        rewrite_by_lua_file inflate_body.lua;
    }