HTTP自定义头部在PHP中的命名转换：RFC 3875解析

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.util.concurrent.CompletableFuture;

public class HttpClientExample {
    public static void main(String[] args) {
        HttpClient client = HttpClient.newBuilder().build();
        HttpRequest request = HttpRequest.newBuilder()
                .uri(URI.create("http://php-fpm:80")) // 替换为你的PHP服务地址
                .header("Content-Type", "application/json")
                .header("X-Auth-HMAC", "test_hmac_header_value") // 自定义头部
                .POST(HttpRequest.BodyPublishers.ofString("{\"message\":\"hello from java\"}"))
                .build();

        CompletableFuture<HttpResponse<String>> responseFuture = client.sendAsync(
                request,
                HttpResponse.BodyHandlers.ofString()
        );

        responseFuture.thenAccept(response -> {
            System.out.println("Status Code: " + response.statusCode());
            System.out.println("Response Body: " + response.body());
        }).join(); // 等待异步操作完成
    }
}

<?php
// 打印所有 $_SERVER 变量，观察 HTTP 头部
echo '<pre>';
print_r($_SERVER);
echo '</pre>';

// 直接访问转换后的头部
if (isset($_SERVER['HTTP_X_AUTH_HMAC'])) {
    $hmacHeader = $_SERVER['HTTP_X_AUTH_HMAC'];
    echo "从 \$ _SERVER 获取的 X-Auth-HMAC 值: " . $hmacHeader . "\n";
} else {
    echo "HTTP_X_AUTH_HMAC 头部未找到。\n";
}

// 进一步展示其他获取头部的方法
echo "\n--- 使用 getallheaders() 获取所有头部 ---\n";
if (function_exists('getallheaders')) {
    $headers = getallheaders();
    print_r($headers);
    if (isset($headers['X-Auth-HMAC'])) {
        echo "从 getallheaders() 获取的 X-Auth-HMAC 值: " . $headers['X-Auth-HMAC'] . "\n";
    }
} else {
    echo "getallheaders() 函数不可用 (例如在某些 PHP SAPI 环境下)。\n";
}
?>

[
  ...
  "HTTP_HOST" => "php-fpm:80",
  "HTTP_CONTENT_TYPE" => "application/json",
  "HTTP_X_AUTH_HMAC" => "test_hmac_header_value", // 转换后的自定义头部
  ...
]
从 $_SERVER 获取的 X-Auth-HMAC 值: test_hmac_header_value

--- 使用 getallheaders() 获取所有头部 ---
Array
(
    [Host] => php-fpm:80
    [Content-Type] => application/json
    [X-Auth-HMAC] => test_hmac_header_value // 原始名称的自定义头部
)
从 getallheaders() 获取的 X-Auth-HMAC 值: test_hmac_header_value