*/
try {
$request->getHeader('Some-Header-That-Isnt-Assigned');
die('Expected exception not thrown');
} catch (DomainException $e) {
// Yep, it worked correctly.
}
/**
* Most HTTP headers may appear multiple times in the same message. For this reason it makes sense
* to represent all message headers as arrays. When you retrieve a header it will be returned as a
* numerically-indexed array:
*/
$contentType = $request->getHeader('content-type');
assert(is_array($contentType));
// true
assert($contentType[0] === 'text/plain');
// true
/**
* As a result, if you're interested in header fields for which there *should* only exist a single
* value you should access them in this manner:
*/
if ($request->hasHeader('CONTENT-TYPE')) {
$contentType = current($request->getHeader('Content-TYPE'));
assert($contentType === 'text/plain');
}
/**
* Finally, you can clear all headers from a message in one fell swoop:
*/
$request->removeAllHeaders();
assert(!$request->getAllHeaders());
