Check if the passed data contains a full set of headers (that is, contain a \r\n\r\n sequence), and if so - parses them, removes them from data (so that it contains only the message body), and returns true; otherwise returns false. The header string data is duplicated to the managed heap. ditto
As above, but treat the first line differently, and return it in firstLine.
Parse headers from the given string.
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Header parsing