Cast the stream to string instead of getting the contents #69
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PHP FIG PSR-7 describes getContents as "Returns the remaining contents in a string", while the interface description mentions "[...] including serialization of the entire stream to a string.".
For some implementations of PSR-7 the stream is not rewinded and thus getContents turns out to be an empty string in some cases. Also see https://github.com/php-fig/http-message/blob/efd67d1dc14a7ef4fc4e518e7dee91c271d524e4/src/StreamInterface.php#L136-L143 and Nyholm/psr7#135 (comment).