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Way to decode websocket frames? [message #59046]

Thu, 20 October 2022 13:17

Wermann33
Messages: 12
Registered: October 2022
Location: Vienna

Promising Member

Hi!

Is there a way implemented in U++ Websocket to decode the frames received as Websocket client I oversee?
The String Text get by WebSocket::Receive() is encoded (for example "/233/234...") Sad

Thanks

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Re: Way to decode websocket frames? [message #59047 is a reply to message #59046]

Thu, 20 October 2022 19:11

omari
Messages: 276
Registered: March 2010

Experienced Member

Hi,

by default, in the Upp implementation, we accept frame compression when the server can do it.
the frame then is zip compressed, but without header.

as a quik solution, you can disable compression :

in the file: upp\uppsrc\Core\WebSocket.cpp, comment out ( or remove) the line (27)

//		"Sec-WebSocket-Extensions: permessage-deflate\r\n"

regards,
Abdelghani OMARI.

regards
omari.

[Updated on: Sat, 22 October 2022 08:44]

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Re: Way to decode websocket frames? [message #59050 is a reply to message #59047]

Fri, 21 October 2022 07:25

Wermann33
Messages: 12
Registered: October 2022
Location: Vienna

Promising Member

Thank you very much for your reply Abdelghani!!

That helped me a lot!

Only out of interest: do you know how to decompress the message, if permessage-deflate isnt out-commented?
With extra libraries?

Best regards and thank you again!
Joe

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Re: Way to decode websocket frames? [message #59053 is a reply to message #59050]

Sat, 22 October 2022 08:43

omari
Messages: 276
Registered: March 2010

Experienced Member

Hi,

Zlib is included in U++.


String ZDecompressWS(String s){

	StringStream out;
	MemReadStream in(~s, s.GetCount());
	ZDecompress(out, in, in.GetLeft(), [](int64, int64){ return true;}, false);
	
	return out.GetResult();
	
}

regard,
Abdelghani OMARI.

regards
omari.

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Re: Way to decode websocket frames? [message #59060 is a reply to message #59053]

Mon, 24 October 2022 08:48

Wermann33
Messages: 12
Registered: October 2022
Location: Vienna

Promising Member

thank you

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