There are many alternatives to WebScarab for Linux and since it's discontinued a lot of people are looking for a replacement. The best Linux alternative is Charles. It's not free, so if you're looking for a free alternative, you could try Zed Attack Proxy (ZAP) or HttpFox. If that doesn't suit you, our users have ranked nine alternatives to WebScarab and four of them are available for Linux so hopefully you can find a suitable replacement.
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).
The Zed Attack Proxy (ZAP) is an easy to use integrated penetration testing tool for finding vulnerabilities in web applications.
HttpFox monitors and analyzes all incoming and outgoing HTTP traffic between the browser and the web servers.
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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