PHP Using cURL and GET request with a header

Question

There are slimier questions in the past like below.

How do I send a GET request with a header from PHP?

But I don't know why my code is not working. I want to get "status code 200 OK and image data in binary" by using cURL and GET request with a header.

I may make mistake on debugging too. I would appreciate your any help. Thanks in advance!

API refrence: https://devdocs.line.me/en/#get-content

$url = "https://api.line.me/v2/bot/message/". $message_id. "/content";
$curl = curl_init("$url");
error_log(var_export($curl));

curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false); // 証明書の検証を行わない
curl_setopt($curl, CURLOPT_HTTPHEADER, array(
    'Authorization: Bearer ' . $accessToken,
));

$response = curl_exec($curl);
$header_size = curl_getinfo($curl, CURLINFO_HEADER_SIZE);
$header = substr($response, 0, $header_size);
$image_binary = substr($response, $header_size);
curl_close($curl);

error_log(print_r("xxx...",true));
error_log(var_export($response));
error_log(print_r("aaa...",true));
error_log(print_r($response,true));
error_log(print_r("bbb...",true));
error_log(print_r($header,true));
error_log(print_r("ccc...",true));
error_log(print_r($image_binary,true));

Then.. I get this...

2017-01-01T01:04:48.272544+00:00 app[web.1]: [01-Jan-2017 10:04:48 Asia/Tokyo] 
2017-01-01T01:04:48.911005+00:00 app[web.1]: [01-Jan-2017 10:04:48 Asia/Tokyo] xxx...
2017-01-01T01:04:48.911023+00:00 app[web.1]: [01-Jan-2017 10:04:48 Asia/Tokyo] 
2017-01-01T01:04:48.911063+00:00 app[web.1]: [01-Jan-2017 10:04:48 Asia/Tokyo] aaa...
2017-01-01T01:04:48.911125+00:00 app[web.1]: [01-Jan-2017 10:04:48 Asia/Tokyo] ����
2017-01-01T01:04:48.911165+00:00 app[web.1]: [01-Jan-2017 10:04:48 Asia/Tokyo] bbb...
2017-01-01T01:04:48.911201+00:00 app[web.1]: [01-Jan-2017 10:04:48 Asia/Tokyo] ����
2017-01-01T01:04:48.911239+00:00 app[web.1]: [01-Jan-2017 10:04:48 Asia/Tokyo] ccc...
2017-01-01T01:04:48.911273+00:00 app[web.1]: [01-Jan-2017 10:04:48 Asia/Tokyo] ��

Answer 1

According to PHP documentation for CURLOPT_HEADER:

TRUE to include the header in the output.

Your $response will probably look like this:

HTTP/1.1 200 OK
Some: headers
More: header lines

{
    "real": "json content"
}

This is because you added the CURLOPT_HEADER option.

You don't need to set any options to let the curl request send your headers. As long as you set the CURLOPT_HTTPHEADER option, the headers will be sent.

If you really want to receive the response headers too, check existing questions like "Can PHP cURL retrieve response headers AND body in a single request?"