唯一的方法，我设法看到我的外向头(卷曲与php)是使用以下选项:

curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLINFO_HEADER_OUT, true);

获取调试信息:

$data = curl_exec($ch);
var_dump($data);
var_dump(curl_getinfo($ch));

将报头转储到一个文件中，将响应的有效负载转储到另一个文件中

curl -k -v -u user:pass  "url" --trace-ascii headers.txt >> response.txt

唯一的方法，我设法看到我的外向头(卷曲与php)是使用以下选项:

curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLINFO_HEADER_OUT, true);

获取调试信息:

$data = curl_exec($ch);
var_dump($data);
var_dump(curl_getinfo($ch));

下面是我的http客户端在php使post查询包含cookie:

function http_login_client($url, $params = "", $cookies_send = "" ){

    // Vars
    $cookies = array();
    $headers = getallheaders();

    // Perform a http post request to $ur1 using $params
    $ch = curl_init($url);
    $options = array(   CURLOPT_POST => 1,
                        CURLINFO_HEADER_OUT => true,
                        CURLOPT_POSTFIELDS => $params,
                        CURLOPT_RETURNTRANSFER => 1,
                        CURLOPT_HEADER => 1,
                        CURLOPT_COOKIE => $cookies_send,
                        CURLOPT_USERAGENT => $headers['User-Agent']
                    );

    curl_setopt_array($ch, $options);

    $response = curl_exec($ch);

///调试信息 echo $响应; var_dump (curl_getinfo (ch)美元); ///

    // Parse response and read cookies
    preg_match_all('/^Set-Cookie: (.*?)=(.*?);/m', $response, $matches);

    // Build an array with cookies
    foreach( $matches[1] as $index => $cookie )
        $cookies[$cookie] = $matches[2][$index];

    return $cookies;
} // end http_login_client

curl -s -v -o/dev/null -H "Testheader: test" http://www.example.com

如果你想发送HEAD请求而不是GET请求，你也可以使用-I选项。

我认为curl -verbose/-v是最简单的。它将输出请求头(以'>'为前缀的行)，而无需写入文件:

$ curl -v -I -H "Testing: Test header so you see this works" http://stackoverflow.com/
* About to connect() to stackoverflow.com port 80 (#0)
*   Trying 69.59.196.211... connected
* Connected to stackoverflow.com (69.59.196.211) port 80 (#0)
> HEAD / HTTP/1.1
> User-Agent: curl/7.16.3 (i686-pc-cygwin) libcurl/7.16.3 OpenSSL/0.9.8h zlib/1.2.3 libssh2/0.15-CVS
> Host: stackoverflow.com
> Accept: */*
> Testing: Test header so you see this works
>
< HTTP/1.0 200 OK
...