What is GuzzleHttp?

[Dkf]

Why do I constantly get an HTTP error that doesn't fall within the range of 100-599?

Code:

Code:

InvalidArgumentException: Status code must be an integer value between 1xx and 5xx. in src/vendor/guzzlehttp/psr7/src/Response.php at line 152
GuzzleHttp\Psr7\Response->assertStatusCodeRange() in src/vendor/guzzlehttp/psr7/src/Response.php at line 99
GuzzleHttp\Psr7\Response->__construct() in src/vendor/guzzlehttp/guzzle/src/Handler/EasyHandle.php at line 81...

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