Implementing Request Proxy and Reverse Proxy for Baidu Wenxin Yiyan API Using PHP

Implementing Request Proxy and Reverse Proxy for Baidu Wenxin Yiyan API Using PHP

Overview

The Baidu Wenxin Yiyan API offers a variety of random sentences and famous quotes, widely used in websites and apps. Due to call restrictions and security concerns, using proxy or reverse proxy to access this API is a common requirement. Proxying not only hides the real IP but also optimizes request headers to improve request success rates.

Request Proxy

A request proxy means that client requests are first sent to a proxy server, which then initiates requests to the Baidu Wenxin Yiyan API on behalf of the client. This hides the real IP and spoofs request headers. Below is a sample PHP code to create a simple HTTP proxy server:

<?php
// Create a proxy server
$proxy = stream_socket_server('tcp://127.0.0.1:8000', $errno, $errstr);
if (!$proxy) {
    die("Failed to create proxy server: $errstr ($errno)");
}

while (true) {
    // Accept client connection
    $client = stream_socket_accept($proxy);
    if ($client) {
        // Read request from client
        $request = fread($client, 8192);

        // Modify request header to mimic Baidu Wenxin Yiyan API request
        $request = str_replace(
            'Host: localhost:8000',
            'Host: api.lovelive.tools',
            $request
        );

        // Connect to API server
        $api = stream_socket_client('tcp://api.lovelive.tools:80', $errno, $errstr, 30);
        if ($api) {
            // Send request to API
            fwrite($api, $request);

            // Relay API response back to client
            while (!feof($api)) {
                fwrite($client, fread($api, 8192));
            }
            fclose($api);
        } else {
            fclose($client);
        }
    }
}
fclose($proxy);

Save the code as proxy.php and run from the command line:

php proxy.php

The proxy server will now run on 127.0.0.1:8000.

Example of sending a request through the proxy using curl:

curl -x localhost:8000 https://api.lovelive.tools/api/SweetNothings/1

Reverse Proxy

Reverse proxy involves configuring a server to forward client requests to a target API server, enabling load balancing and request forwarding. Below is an example Nginx configuration that forwards requests to the local proxy server:

server {
    listen 80;
    server_name api.mydomain.com;

    location / {
        proxy_pass http://localhost:8000;
        proxy_set_header Host api.lovelive.tools;
    }
}

Sample PHP code for reverse proxy to forward requests and return responses:

<?php
// Connect to API server
$api = stream_socket_client('tcp://api.lovelive.tools:80', $errno, $errstr, 30);
if ($api) {
    // Read request body from client
    $request = file_get_contents('php://input');

    // Send request to API
    fwrite($api, $request);

    // Relay API response back to client
    while (!feof($api)) {
        echo fread($api, 8192);
    }
    fclose($api);
} else {
    header('HTTP/1.1 500 Internal Server Error');
    echo "Failed to connect to API server";
}

Save this as reverse_proxy.php and run:

php -S localhost:8000 reverse_proxy.php

The reverse proxy server will now run on localhost:8000.

Clients send requests directly to api.mydomain.com, and the server forwards them to Baidu Wenxin Yiyan API and returns the responses.

Summary

This article introduced how to use PHP to implement request proxy and reverse proxy for the Baidu Wenxin Yiyan API. These techniques help developers control API requests flexibly and enhance application security. The proxy server hides IP addresses, while the reverse proxy supports load balancing and request forwarding. The provided examples and configurations are straightforward and customizable to suit various business needs.