WebScarab is described as 'There is no shiny red button on WebScarab, it is a tool primarily designed to be used by people who can write code themselves, or at least have a pretty good understanding of the HTTP protocol. If that sounds like you, welcome!' and is a Web Debugger in the development category. There are nine alternatives to WebScarab for a variety of platforms, including Windows, Linux, Mac, Mozilla Firefox and Web-based apps. The best WebScarab alternative is Fiddler, which is free. Other great apps like WebScarab are Charles, Shodan, Zed Attack Proxy (ZAP) and HTTP Debugger.
Web Debugging Proxy that logs all HTTP(S) traffic for comprehensive analysis. It allows manipulation of traffic, supports scripting, and extends with .NET. Debugs virtually any application, implementing man-in-the-middle interception with self-signed certificates. Freeware, ideal for developers.
Charles is an HTTP proxy / HTTP monitor / Reverse Proxy that enables a developer to view all of the HTTP and SSL / HTTPS traffic between their machine and the Internet. This includes requests, responses and the HTTP headers (which contain the cookies and caching information).
Shodan is a search engine that lets you find specific computers (routers, servers, etc.) using a variety of filters. Some have also described it as a public port scan directory or a search engine of banners.
The Zed Attack Proxy (ZAP) is an easy to use integrated penetration testing tool for finding vulnerabilities in web applications.
HTTP Debugger Pro - A Professional HTTP Sniffer and Analyzer for Developers.
HttpFox monitors and analyzes all incoming and outgoing HTTP traffic between the browser and the web servers.
HttpWatch is an HTTP viewer and debugger that integrates with IE and Firefox to provide seamless HTTP and HTTPS monitoring without leaving the browser window. It's available as a free edition and a PRO version that cost money and has additional features.
Slowy is an OSX app which simulates custom connection's conditions and limits the network traffic. It is created for web developers that work on a local server, to test a website with a real-world connection.
Uthrottle is a tool which simulates custom connection’s conditions and limits the network traffic to a specified speed on network interfaces. In complex service oriented application stacks, some bugs only manifest themselves on congested or slow
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