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    Lab 12.2

    Posts: 24
    in LFS216 Class Forum

    Hi,
    I exercised Lab.12.2 today and found that the Lab didn't work for me at first .

    From secondary machine , I did;
    # nc main.example.com 80

    but received the message like;

    1. [student@secondary Desktop]$ nc  main 80
    2. GET / HTTP/1.1
    3. Host: foo.example.com
    4. Referrer: secondary.example.com
    5. User-Agent: test-browser
    6. HTTP/1.1 400 Bad Request
    7. Date: Sun, 04 Jul 2021 08:16:35 GMT
    8. Server: Apache/2.4.37 (centos)
    9. Content-Length: 226
    10. Connection: close
    11. Content-Type: text/html; charset=iso-8859-1
    12.  
    13. <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
    14. <html><head>
    15. <title>400 Bad Request</title>
    16. </head><body>
    17.  
    18.  
    19. Bad Request
    20.  
    21.  
    22.  
    23.  
    24. Your browser sent a request that this server could not understand.

    The main machine (httpd works) says;

    10.0.2.20 - - [04/Jul/2021:17:16:35 +0900] "GET / HTTP/1.1\n" 400 226 "-" "-"

    The problem is unnecessary "\n"

    so I excuted netcat with the option "-C" and works well

    1. [student@secondary Desktop]$ nc -C main 80
    2. GET / HTTP/1.1
    3. Host: foo.example.com
    4. Referrer: secondary.example.com
    5. User-Agent: test-browser
    6.  
    7. HTTP/1.1 200 OK
    8. Date: Sun, 04 Jul 2021 08:20:51 GMT
    9. Server: Apache/2.4.37 (centos)
    10. Last-Modified: Sat, 15 May 2021 23:48:43 GMT
    11. ETag: "14-5c26700209e14"
    12. Accept-Ranges: bytes
    13. Content-Length: 20
    14. Content-Type: text/html; charset=UTF-8
    15.  
    16. The test page works
    17.  

    Thanks.

    Comments

    • Posts: 380
      edited July 2021

      Thank you for posting the issue.
      I can confirm the problem was duplicated and a change to the lab will be submitted.

      I also found that typing too slowly will trigger a timeout condition. To avoid the timeout create a file with the commands and pipe the file into the nc command.

      My file:

      [root@sec ~]# cat 12.2.cmds
      GET / HTTP/1.1
      Host: node.example.com
      Referrer: foo.example.com
      User-Agent: test-browser

      The command becomes:

      $sudo echo 12.2.cmds | nc -C main.example.com 80

      Thank you for your input.

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