Php parse request header

How to parse / validate / handle http headers in PHP

It must be an array or a string (representing only one value , not a comma-separated list of values!). Solution 1: Indeed, it’s «dangerous» to pass a header name — as argument of , which is is not a string is an empty string The same applies to the header value argument.

How to parse / validate / handle http headers in PHP

Indeed, it’s «dangerous» to pass a header name — as argument of withHeader() , which

The same applies to the header value argument. It must be an array or a string (representing only one value , not a comma-separated list of values!).

As for the implementation of the withHeader method:

/** * Return an instance with the provided value replacing the specified header. * * . * * @param string $name Case-insensitive header field name. * @param string|string[] $value Header value(s). * @return static * @throws \InvalidArgumentException for invalid header names or values. */ public function withHeader($name, $value) < $this ->validateHeaderName($name) ->validateHeaderValue($value) ; $clone = clone $this; $clone->replaceHeader($name, $value); return $clone; > /** * ================= * Not part of PSR-7 * ================= * * Validate header name. * * @param string $name Case-insensitive header field name. * @return $this * @throws \InvalidArgumentException */ protected function validateHeaderName($name) < if (!isset($name)) < throw new \InvalidArgumentException('No header name provided!'); >if (!is_string($name)) < throw new \InvalidArgumentException('The header name must be a string!'); >if (empty($name)) < throw new \InvalidArgumentException('Empty header name provided!'); >return $this; > /** * ================= * Not part of PSR-7 * ================= * * Validate header value. * * @param string|string[] $value Header value(s). * @return $this * @throws \InvalidArgumentException */ protected function validateHeaderValue($value) < if (isset($value) && !is_array($value) && !is_string($value)) < throw new \InvalidArgumentException('The header value must be a string or an array!'); >return $this; > /** * ================= * Not part of PSR-7 * ================= * * Replace a header item with a new one. * * @param string $name Case-insensitive header field name. * @param string|string[] $value Header value(s). * @return $this * @done */ protected function replaceHeader($name, $value) < $this ->removeHeader($name) ->addHeader($name, $value) ; return $this; > 

You can find that in RFC 7230. Check Zend Diactoro’s HeaderSecurity class for an implementation.

How do I read any request header in PHP, Using this solution I only see some of the request headers, and in this case, i don’t see the one I want. Chrome is sending a cache-control header, but I do not see it anywhere in $_SERVER.I do see several headers prefixed with HTTP_, including «HTTP_ACCEPT», and «HTTP_UPGRADE_INSECURE_REQUESTS» and … Code samplefunction getRequestHeaders() $value) ‘HTTP_’)

How to obtain a specific http header in php

If I recall correctly, the header «My-Special-Header» would be accessible as

var_dump($_SERVER['HTTP_MY_SPECIAL_HEADER']); 

Either way, check out the $_SERVER superglobal.

root@vagrant-ubuntu-trusty-64:/var/www# curl --header "My-Special-Header: Foobar" http://127.0.0.1/headers.php 
Array ( .. [HTTP_MY_SPECIAL_HEADER] => Foobar ) 
 
How to check whether header() has been set in PHP?, Add a comment. 4. Try using header_list () to determine what headers are ready to be sent to the client. Use headers_sent () to check if headers have been sent to the client. Share. Improve this answer. edited Dec 4, 2014 at 2:34. Gajus. 63.7k 68 261 412.
 
How to check if Headers already been sent in PHP
 
PHP has a function headers_sent() which allows you to check if the headers are already sent out before you take any action. Here’s how you could use the function in your code:
 
Yup, you can use the headers_sent function.
 
 
Checks if or where headers have been sent.
 
You can't add any more header lines using the header() function once the header block has already been sent. Using this function you can at least prevent getting HTTP header related error messages. Another option is to use Output Buffering.
 
 
headers_list may also be of interest, which returns an array of all headers sent.
 
How to parse / validate / handle http headers in PHP, Indeed, it's "dangerous" to pass a header name - as argument of withHeader (), which. is NULL. is not a string. is an empty string. The same applies to the header value argument. It must be an array or a string (representing only one value, not a comma-separated list of values!). As for the implementation of the withHeader …
 
Get custom request header
 
$headers = getallheaders(); $message = $headers['api_key']; 
 
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How to Read Request Headers in PHP
 
When typing a URL in the browser's address bar and trying to access it, an HTTP request is sent to the server by the browser. It encompasses information in a text-record state including the type, the capabilities, user’s operation system, the browser generating the request, and more.
 
Getting the request header, the web server sends an HTTP response head to the client.
 
Below, we will show you how to read any request header in PHP.
 
Using the getallheaders() Function
 
To achieve what was described above, you can use the getllheaders() function.
 
Let’s check out an example with its output:
 
 foreach (getallheaders() as $name => $value) < echo "$name: $value 
"; > ?>
 
Host: 127.0.0.3:2025 Connection: keep-alive Cache-Control: max-age=0 Upgrade-Insecure-Requests: 1 User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.67 Safari/537.36 Accept: text/html, application/xhtml+xml, application/xml;q=0.9, image/webp, image/apng, */*;q=0.8 Accept-Encoding: gzip, deflate, br Accept-Language: en-US, en;q=0.9
 
Using apache_request_headers() Function
 
Now, let’s check out an example of using another helpful method that is the apache_request_headers() function:
 
 $header = apache_request_headers(); foreach ($header as $headers => $value) < echo "$headers: $value 
\n"; > ?>
 
The output will look as follows:
 
Host: 127.0.0.6:2027 Connection: keep-alive Cache-Control: max-age=0 Upgrade-Insecure-Requests: 1 User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.67 Safari/537.36 Accept: text/html, application/xhtml+xml, application/xml;q=0.9, image/webp, image/apng, */*;q=0.8 Accept-Encoding: gzip, deflate, br Accept-Language: en-US, en;q=0.9
 
Describing HTTP Headers
 
An HTTP header is considered a code, which transfers the data between the browser and the web server.
 
Generally, HTTP headers are used for the communication between the client and the server in both of the directions.
 
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Handling response headers from cURL requests in PHP
 
Getting the HTTP response headers with cURL in PHP is not straight forward. There is no build-in way to do this, but we can still cut out the headers from the response message, if CURLOPT_HEADER is true.
 
 
 
When a HTTP request has been received by a server, typically a response is sent back to the client, and the server response will usually consist of two parts; the Response Header and the Response Body.
 
The header part of the response contains all the response headers, including cookies (if any) and information about the mime type of the content. The response body contains the content, which should match the mine-type in the headers. For example, common mime-types might be text/html for HTML pages, and text/css for external StyleSheets.
 
To show the response headers to a given request, we can simply cut out the headers using a combination of the options and functions. A more detailed explanation of this is available in the next section of the article, for those interested.
 
A quick full example is included below:
 
$url = "https://beamtic.com/api/user-agent"; $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); curl_setopt($ch, CURLOPT_HEADER, 1); $response = curl_exec($ch); // Retudn headers seperatly from the Response Body $header_size = curl_getinfo($ch, CURLINFO_HEADER_SIZE); $headers = substr($response, 0, $header_size); $body = substr($response, $header_size); curl_close($ch); header("Content-Type:text/plain; charset=UTF-8"); echo $headers; echo $body; 
 
The above will output something like:
 
HTTP/1.1 200 OK date: Sun, 21 Feb 2021 12:11:57 GMT server: 0 cache-control: no-cache expires: -1 allow: GET, HEAD strict-transport-security: max-age=31536000; includeSubDomains vary: Accept-Encoding content-encoding: br x-frame-options: SAMEORIGIN content-length: 10252 content-type: text/html; charset=utf-8 
 
The response code is always the first line that is returned in the response head.
 
Obtaining headers as key : value pairs
 
As discussed in the article on parsing response headers in PHP, we can also create an associative array containing key : value pairs. Since we already got the headers, we could do like this:
 
// Convert the $headers string to an indexed array $headers_indexed_arr = explode("\r\n", $headers); // Define as array before using in loop $headers_arr = array(); // Remember the status message in a separate variable $status_message = array_shift($headers_indexed_arr); // Create an associative array containing the response headers foreach ($headers_indexed_arr as $value)  if(false !== ($matches = explode(':', $value, 2)))  $headers_arr["$matches[0]>"] = trim($matches[1]); > > // Show that it works header('content-type: text/plain; charset=utf-8'); print_r($headers_arr);exit(); 
 
Retrieving the response headers
 
There is no build-in way to only return the response headers using cURL in PHP. However, we can still "cut" them from the full response. To do this, we first determine the size of the response header, and then simply cut it from the response using the substr() function.
 
First, we set the CURLOPT_HEADER option true. Doing this will include the headers in the response downloaded by cURL. Next, we will need to cut out the headers.
 
Using this method, we can return both the body and header part of the response. However, before we can separate the components of the response, we need to get the size of the header. This can be done using curl_getinfo() with the CURLINFO_HEADER_SIZE option, as shown below:
 
$header_size = curl_getinfo($ch, CURLINFO_HEADER_SIZE); 
 
Finally, we may use the value returned by curl_getinfo() with substr() to seperate the headers from the response message.
 
$headers = substr($response, 0, $header_size); $body = substr($response, $header_size); 
 
Create an array containing each header
 
In order to better work with the individual headers, we should place them in an array. HTTP Headers are separated by a Carriage Return and a Line Feed, also known as CRLF (Sometimes also represented as: [CR][LF]). Knowing this, we can create an array from the raw headers using the PHP explode() function.
 
$headers_arr = explode("\r\n", $headers); // The separator used in the Response Header is CRLF (Aka. \r\n) print_r($headers_arr); // Shows the content of the $headers_arr array 
 
As you can see, we also have a couple of empty entries. To remove those, we can pass the array to the array_filter() function:
 
$headers_arr = array_filter($headers_arr); 
 
Finally, we can easily work on the array in a loop.
 
Tools:
 
You can use the following API endpoints for testing purposes:
 
https://beamtic.com/api/user-agent
 
https://beamtic.com/api/request-headers
 
Share with your friends:
 
Tell us what you think:
 
 
Alonso Quinones
 
Great walkthrough, thanks.
Maybe you could also add how to split the result into key/value - pairs, since currently each array object is one long string.
/Regards, Alonso
 
 
Timilica
 
Hello,
I have a big problem with cURL trying to get passed a login page.
I've used all the necessary cURL options (CURLOPT_COOKIEJAR, CURLOPT_COOKIEFILE, CURLOPT_FOLLOWLOCATION) to get cURL pass the login page but with no luck. I'm trying to pass the login on http://apps.allogalogistics.ro and get some records on another page. The login page has a redirect.
 
I make a POST req on the login page and I save the cookies in a cookies.txt with CURLOPT_COOKIEJAR and CURLOPT_COOKIEFILE. I see that after the POST req another GET req is initiated in the login process. I tried everything I read but all I can see from cURL is the login page with the username/password empty (not logged) even if the response is 200 OK.
 
Can you pls give me an advice?
 
 
Lawrence Kennon
 
This is a useful article. I encapsulated a lot of this code into a function that I am using in a lot of command line scripts on Mac for a number of purposes at work. Thanks!
 
 
EcoTechie
 
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