php sending http headers

Question

I use php function file_get_contents and one of params is http headers. I make them such like this:

if (strpos($key, 'HTTP_') === 0) {
    $key = strtolower(strtr(substr($key, 5), '_', '-'));
    $this->headers .= $key . ': ' . $value . '\r\n';
}

but here is a problem, I should send headers in double quotes like this:

"Connection: close\r\nContent-Length: $data_len\r\n"

Here is an example of how do I make request:

$opts = array(
        'http'  =>  array(
            'method'    => "GET",
            'header'    => $this->headers
        )
);

$this->data = file_get_contents('http://phd.yandex.net/detect', false, stream_context_create($opts));

but it is fails. If I replace $this->headers in array with a custom string of http headers, everything works fine.

how to make it works right?

What's your custom string look like, v.s. what the above code generates? — Marc B
– Marc B, Commented Oct 19, 2011 at 16:06
You are missing quotes around the \r\n in the first code section - could this be the problem? I suspect it will not parse but you never know... — DaveRandom
– DaveRandom, Commented Oct 19, 2011 at 16:08

animuson · Accepted Answer · 2011-10-19 16:13:19Z

5

The \r\n needs to be in double quotes so that the characters are parsed correctly. Everything else can be appended using single quotes, no problem. Only a few things are parsed using the backslash in single quoted strings, such as \\, \', and \".

Your headers are looking like this:

Key: Value\r\nKey: value\r\n

Where the \r\n is appearing as an actual string, when you want it to look like this:

Key: Value
Key: Value

Where the \r\n actually creates a new line in the headers.

answered Oct 19, 2011 at 16:13

animuson♦

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