For example, with Fiddler you can set breakpoints and tamper with the HTTP data before it is sent or received. I'm using Fiddler as a localhost sniffer that's limited to the HTTP protocol, but it does have some capabilities beyond what you'd see in a sniffer. There's tons of supporting documentation on how to use it, including two MSDN articles. I had some erratic results under IE7, but Fiddler basically works as advertised. What's a poor developer to do? The only recourse is a local HTTP proxy, such as Fiddler:įiddler has some special integration with IE that makes it particularly easy to use, but it can be used with Firefox as well. Localhost packets don't pass through the regular network stack, so they're invisible to an ethernet sniffer. However, Windows ethernet sniffers do have one significant limitation: they can't sniff localhost traffic. Ethernet sniffers should be a standard tool in your development troubleshooting toolkit, too.
I frequently use sniffers to troubleshoot servers and desktops alike. Installing a sniffer, even after installing the required WinPcap packet capture library, doesn't require a reboot. I've had great success using ethernet sniffers (such as Etherdetect, or Ethereal) to troubleshoot communication problems.
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