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5. Fiddler Tool For Http Debugging

In previous jobs when I've worked on a Windows machine, I've used Fiddler for viewing HTTP transactions and debugging.

I'm specifically looking to monitor the HTTP transactions for an ajax site I'm working on to verify that the site is doing what I expect. Rewriting HTTP (as provided by Fiddler) is a nice-to-have, but not essential.

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This tool is meant to capture the HTTP and HTTPS traffic in a web browser in PC, Mac as well as an iOS device. In order to capture the HTTP traffic, you need to install the tool on PC or Mac machines to check the traffic with respective to your machine as well as an iOS device.

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closed as off-topic by ChrisF, nc4pk, mpy, Shekhar, MosesNov 12 '13 at 18:23

This question appears to be off-topic. The users who voted to close gave this specific reason:

• 'Questions seeking product, service, or learning material recommendations are off-topic because they tend to become obsolete quickly. Instead, describe your situation and the specific problem you're trying to solve. Here are a few suggestions on how to properly ask this type of question.' – ChrisF, nc4pk, mpy, Shekhar, Moses

15 Answers

Use Chrome and navigate to chrome://net-internals/

It allows detailed analysis and dumps.

I found Charles Proxy. It's much closer to the functionality of Fiddler. It's not free, but it may be worth the price.

I've used mitmproxy for intercepting HTTP traffic. It's a great tool and you can use it for debugging mobile devices as well or any operating system for that matter.

My favorite mac app for monitoring traffic is HTTPScoop, I detail that as well as using tcpdump from the commandline in this post I blogged last year.

Not what you asked, but in Firefox the Live HTTP Headers add-on is all I need if I want to edit and re-play requests, including changing the URL and the HTTP method.

In Firebug, the Network Monitoring shows all requests and responses. Likewise, in Safari the Resources pane of the built-in Web Inspector covers most of my needs as well. (Enable the Web Inspector through the preferences: Show Develop menu in menu bar.) Chrome and Firefox have similar tools.

When things get more complicated, I fire up my Wireshark packet sniffer. However, unlike Fiddler, Wireshark does not let you change the data, and does not support things like auto responders, like Fiddler apparently does.

For Wireshark, see Hyper Text Transfer Protocol (HTTP) for some generic HTTP capturing information, and HTTP Packet Capturing to debug Apache, for some example display filters. (You may want to set the capture filter to 'port 80', to show all requests to that port, and responses from that port. Or, to limit to some server, use capture filter 'port 80 and host www.google.com'.) Like:

Note that Wireshark can decompress gzip or deflate encoded (compressed) things on the fly for you. That makes things much easier to read as most web servers will compress the data they send to a browser.

(As for auto responders: the excellent JS Bin has a short video on how to use it to debug Ajax requests. If you don't know JS Bin, then first view the introduction video.)

In addition to Charles (already mentioned), I also like the HttpFox add-on for Mozilla Firefox. Like Charles, you can use it on both Mac and Windows. It's lighter-weight than Charles because it lives in the browser, useful for quick troubleshooting. Here's some information from the HttpFox page:

HttpFox monitors and analyzes all incoming and outgoing HTTP traffic between the browser and the web servers.

It aims to bring the functionality known from tools like HttpWatch or IEInspector to the Firefox browser.

Information available per request includes:

• Request and response headers
• Sent and received cookies
• Querystring parameters
• POST parameters
• Response body

And, a screenshot:

Not a proxy, but it does help in debugging HTTP:

Simply start a scan on the interface you're going to have the HTTP traffic on, execute the traffic and then stop scanning and type 'HTTP' as the filter string. You will then be able to inspect all the packets of the HTTP conversation. With the Packet Detail view open you can open the HTTP section and it will stay open between packets.

It's a great tool to have and it doesn't require you to change the browser proxy. On the other hand it cannot help with HTTPS traffic since that's encrypted. (Although it can decrypt SSL connections that use RSA)

I'm late but - I use Paros Proxy. It's in Java, so, cross-platform. Though if you would prefer for it to be packaged as an app, there's one here at the bottom.

Don't forget Burp Suite. They have a free version. It's cross platform. http://portswigger.net/burp/

It seems that the free GlimmerBlocker can do part of the trick.

Of course it can block all kind of content, and transform responses before the browser receives them. But it can in fact modify both requests and responses. And though not true debugging, it also offers logging. So, it might suit basic needs:

There are 4 types of scripts running inside GlimmerBlocker, and some objects are only defined for some of the script types:

• global proxy: this sets the global proxy settings, and can test for e.g. location name, AirPort network.
• request modification: this can change the requested URL, send back a redirect response to the browser, or send text/html back to the browser.
• keyword expansion. [Safari-only, AvB]
• transform: modify the response received by the web-server before it is sent back to Safari [or any browser that is set up to use the proxy provided by GlimmerBlocker, AvB].

(One can also use it to include various Greasemonkey scripts in the received response, without using a Greasemonkey add-on, like to block Flash without installing any add-on.)

You can easily configure Fiddler for Mac using Parallels as per instructions on their site.

The only caveat is that you have to manually configure your Network settings to point to the IP address of the VM but not really that big of a deal.

jMeter might also be helpful; it's designed for testing load performance on web servers, but it might still do what you need. jMeter is written in Java, so you can download a .jar file that will run on Mac, Windows, or Linux.

If you're dealing with app traffic or third-party API integrations that go over the public internet, you should try Runscope (of which, full disclosure, I am a co-founder). It captures HTTP requests to any URL, gives you a nice stream view for debugging and makes it easy to share individual requests with others.

You could also try APIKitchen. It helps you in debugging and testing HTTP APIs and any requests in general. It also has an offline version for testing in your internal networks. No installation necessary.

Download Fiddler For Mac

Fiddler For Mac Os X

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Fiddler allows you to inspect traffic, set breakpoints, and 'fiddle' with incoming or outgoing data. Fiddler includes a powerful event-based scripting subsystem, and can be extended using any .NET language.

Fiddler is freeware and can debug traffic from virtually any application that supports a proxy, including Internet Explorer, Google Chrome, Apple Safari, Mozilla Firefox, Opera, and thousands more. You can also debug traffic from popular devices like Windows Phone, iPod/iPad, and others.

Web Session Manipulation

Edit web sessions easily:just set a breakpoint to pause the processing of the session and permit alteration of the request/response. Compose your own HTTP requests and run them through Fiddler.

Performance Testing

Fiddler lets you see the “total page weight,” HTTP caching and compression at a glance. Isolate performance bottlenecks with rules such as “Flag any uncompressed responses larger than 25kb.”

Customizable Free Tool

Benefit from a rich extensibility model, ranging from simple FiddlerScript to powerful extensions which can be developed using any .NET language.
See full list of ready-made add-ons.

Security Testing

Decrypt HTTPS traffic and display and modify web application requests using a man-in-the-middle decryption technique. Configure Fiddler to decrypt all traffic, or only specific sessions.

HTTP/HTTPS Traffic Recording

Use Fiddler to log all HTTP(S) traffic between your computer and the Internet. Debug traffic from virtually any application that supports a proxy (IE, Chrome, Safari, Firefox, Opera and more).

Web Debugging

Fiddler Tool For Mac

Debug traffic from PC, Mac or Linux systems and mobile (iOS and Android) devices. Ensure the proper cookies, headers and cache directives are transferred between the client and server. Supports any framework, including .NET, Java, Ruby, etc.

What's New:

Fiddler On Mac

• Add Packet Capture Import
• Enhanced Composer
• Enhanced AutoResponder
• Enhanced Protocol Violation detection
• Improved WebView
• Add registry-fallback to EnableLoopback

Fiddler Tool For Http Debugging