networking - I am trying to connect a HTTP server using telnet but it's failing

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networking - I am trying to connect a HTTP server using telnet but it's failing

posted Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

networking - I am trying to connect a HTTP server using telnet but it's failing

I am learning HTTP protocols. I have choose this site for experiment: http://www.testingmcafeesites.com/testcat_ac.html

I have blocked my firewall. Opened command prompt and gave following command:

telnet testingmcafeesites.com 80

that works, then i give this:

GET / HTTP/1.1
Host: testingmcafeesites.com

I have also tried:

GET / testcat_ac.html HTTP/1.1
Host: testingmcafeesites.com

but that also doesn't work. returns:

 HTTP/1.1 400 Bad Request
Content-Type: text/html
Content-Length: 173
Connection: close

<html>
<head><title>400 Bad Request</title></head>
<body bgcolor="white">
<center><h1>400 Bad Request</h1></center>
<hr><center>Avi Vantage/</center>
</body>
</html>

question from:https://stackoverflow.com/questions/66046067/i-am-trying-to-connect-a-http-server-using-telnet-but-its-failing

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1 Reply

深蓝 · Answer 1 · 2021-10-06T03:16:33+0000

Send this instead:

GET / HTTP/1.1
Host: testingmcafeesites.com

GET /testcat_ac.html HTTP/1.1
Host: testingmcafeesites.com

Note the space removed between / and testcat_ac.html. And the extra empty line after the Host header. An HTTP request is terminated by 2 CRLF line breaks:

GET / HTTP/1.1<CRLF>
Host: testingmcafeesites.com<CRLF>
<CRLF>

GET /testcat_ac.html HTTP/1.1<CRLF>
Host: testingmcafeesites.com<CRLF>
<CRLF>

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networking - I am trying to connect a HTTP server using telnet but it's failing

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