PHP中使用CURLOPT发起PUT请求遇400错误求助

问题描述 #

使用PHP的CURLOPT发起PUT请求时遇到400错误，但DELETE和POST方法可正常运行。相关代码如下：

$url = 'https://theURL';
echo " \n URL:\n".$url." "; //The URL is correct
$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "PUT");

$headers[] = 'Content-length: 0'; //I don't have a body so the header is 0
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
$output = curl_exec($ch);
$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);

curl_close($ch);

不添加请求头时，会触发以下错误：

HTTP Error 411. The request must be chunked or have a content length.

设置Content-length: 0后，出现400错误：

REQUEST ERROR: The server encountered an error processing the request.

解决方法 #

方法1：用CURLOPT_PUT替代CURLOPT_CUSTOMREQUEST #

当无请求体时，直接使用CURLOPT_PUT并设置空请求体，CURL会自动处理Content-Length：

$url = 'https://theURL';
$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_PUT, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, '');

$output = curl_exec($ch);
$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);

curl_close($ch);

方法2：改用分块传输编码 #

若服务器支持分块传输，添加Transfer-Encoding: chunked头替代Content-Length：

$url = 'https://theURL';
$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "PUT");

$headers[] = 'Transfer-Encoding: chunked';
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);

$output = curl_exec($ch);
$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);

curl_close($ch);

方法3：发送符合格式的空请求体 #

部分服务器要求PUT请求携带格式合法的内容，可尝试发送空JSON体：

$url = 'https://theURL';
$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "PUT");

$headers[] = 'Content-Type: application/json';
$headers[] = 'Content-Length: 2';
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_POSTFIELDS, '{}');

$output = curl_exec($ch);
$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);

curl_close($ch);

方法4：启用调试定位具体问题 #

添加调试选项，查看完整请求响应细节：

$url = 'https://theURL';
$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "PUT");
$headers[] = 'Content-length: 0';
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);

curl_setopt($ch, CURLOPT_VERBOSE, true);
$verbose = fopen('php://temp', 'w+');
curl_setopt($ch, CURLOPT_STDERR, $verbose);

$output = curl_exec($ch);
$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);

rewind($verbose);
$verboseLog = stream_get_contents($verbose);
echo "调试日志:\n" . $verboseLog;

curl_close($ch);

内容的提问来源于stack exchange，提问作者titusala