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WebSocket Protocol Encoding

Implementation

This encoding is similar to URIComponent encoding.

The Sec-WebSocket-Protocol header contains protocols. Protocol values have a character set. In cases when TompHTTP requires characters outside this range in protocols, this encoding is used.

Encoding

Each character in a string is checked if its in the character set or a reserved character.

If this condition is met, the character is replaced with an escaped value. An escaped value is a percent symbol (0x37, ASCII) followed by the characters hexadecimal code. For example: the string 1/100% would become 1%2F100%25.

Decoding

Each character in a string is iterated over. If the character begins with % then it is assumed the next 2 characters will be a hexadecimal code. The hexadecimal will be read then the % symbol and the next 2 characters will be replaced with the character belonging to the hexadecimal code.

Reserved Characters

%

WebSocket Protocol Characters

!#$%&'*+-.0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ^_`abcdefghijklmnopqrstuvwxyz|~

ASCII characters. 77 Total.