Comments on: Monitoring HTTP traffic to debug your Grails application

By: Mike

Mike — Mon, 07 Sep 2009 08:26:52 +0000

Ted, this proved really helpful! Thanks a lot for the handy tcpdump magic :)

By: Christopher M. Judd

Christopher M. Judd — Mon, 28 Apr 2008 18:55:00 +0000

Eclipse’s Web Tools Platform (WTP) which is included in any of the Eclipse bundles such as Europa include the TCP/IP Monitor view under the Debug category and is very helpful and requires no additional installation if you are already using Eclipse for developing your Grails applications.

http://www.eclipse.org/

By: Jim LoVerde

Jim LoVerde — Tue, 08 Apr 2008 05:05:11 +0000

+1 for Charles. Especially the latest 3.2 release which provides “breakpoint” support. So you can stop a request mid flight, optionally change it, or stop the response before it’s returned and optionally change that. Very nice utility.

http://xk72.com/blog/2008/03/24/charles-32-released/

By: Kurt Ward

Kurt Ward — Sun, 06 Apr 2008 03:55:16 +0000

I have used several utilities over the years, but my favorite tool is Charles (http://www.xk72.com/). It’s Java based so it’s cross-platform, and it has a very nice set of features (including a bandwidth throttle!).

By: Marius Scurtescu

Marius Scurtescu — Thu, 03 Apr 2008 18:21:09 +0000

Also there is “Live HTTP Headers”, another Firefox add-on:
http://livehttpheaders.mozdev.org/
https://addons.mozilla.org/en-US/firefox/addon/3829

AFAIK this was the first Firefox add-on in this class.

By: tednaleid

tednaleid — Thu, 03 Apr 2008 15:18:33 +0000

@Matthew – doh! Wordpress ate a couple of my greater than and less than signs. I’ve fixed the command above.

@Sigfried – that looks like a nice extension and I haven’t seen it before. The ability to modify the request and resend would be very useful without having to hand code something in a groovy or curl script.

By: Matthew Taylor

Matthew Taylor — Thu, 03 Apr 2008 15:05:36 +0000

I think you have a parenthesis out of place in:

alias tcpd8080=”sudo tcpdump -s 0 -A -i lo0 ‘tcp port 8080 and (((ip[2:2] – ((ip[0]&0xf)2)) != 0)’”

I’m not familiar with the command, or I would attempt to fix it ;).

By: Siegfried

Siegfried — Thu, 03 Apr 2008 09:33:19 +0000

Another valuable tool is Tamper Data. It’s a Firefox extension. Definitly worth a look: https://addons.mozilla.org/en-US/firefox/addon/966