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How to send an HTTP message to a specific port in my local machine

Posted on 2011-09-18
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Last Modified: 2013-07-10
Hi,

I am investigating a problem in which one of the processes in the machine get's some message which it does not recognizes.
I want to verify that this is actually the case by trying to reproduce it. Can you please advice:

How to send an HTTP message to a specific port in my local machine?

Thanks!
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Question by:HPBSM
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8 Comments
 
LVL 10

Expert Comment

by:acbxyz
ID: 36556459
When using a browser, you can use a colon after your hostname:
http://localhost:8080/path/to/file

For low-level debugging, you can use telnet, too:
telnet localhost 8080
GET /path/to/file HTTP/1.1
Host: localhost

Open in new window

and 2x return
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LVL 41

Expert Comment

by:noci
ID: 36556489
You can use a browser:

use a url like http://thedevice:someport/

and use the right port number for the port you intend.
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Author Comment

by:HPBSM
ID: 36556528
O.K. Thanks - it seems that I need to send a TCP packet and not using HTTP directly - what can be the best way to do that?
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LVL 10

Expert Comment

by:acbxyz
ID: 36556681
As I said, using telnet with a different port is an option.
Linux has a tool called netcat, which can send data from a file to a network socket and display answer or save them to another file. This seems to be a windows port of it: http://www.securityfocus.com/tools/139
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Assisted Solution

by:noci
noci earned 300 total points
ID: 36556691
(lib)curl can be use for a lot of things,  for various protocol.
Otherwise you would have to build your own client (see: socket, bind, connect, read, write, close).  
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Author Comment

by:HPBSM
ID: 36557179
I am using Win vista an Win 7 and it seems telnet is not working there. What can be done?
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Accepted Solution

by:
acbxyz earned 1200 total points
ID: 36557210
Since Vista telnet needs to be activated as feature.
http://windows.microsoft.com/en-US/windows-vista/Telnet-frequently-asked-questions#
In short: Start -> Control Panel -> Programs -> Turn Windows features on or off -> select telnet client
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Author Comment

by:HPBSM
ID: 36587344
O.K. thanks I will check it out and write back.
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