Analyse your HTTP response headers and find security breaches
mitmproxy is a console tool that allows interactive examination and modification of HTTP traffic. It differs from mitmdump in that all flows are kept in memory, which means that it's intended for taking and manipulating small-ish samples. Use the ? shortcut key to view, context-sensitive documentation from any mitmproxy screen.
HTTPie is a command line HTTP client, a user-friendly cURL replacement.
Requests is a humble HTTP request library. It simplifies how you interact with other sites and takes away all your worries.
Nikto web server scanner.
Nikto is an Open Source (GPL) web server scanner which performs comprehensive tests against web servers for multiple items, including over 6400 potentially dangerous files/CGIs, checks for outdated versions of over 1200 servers, and version specific problems on over 270 servers.
It also checks for server configuration items such as the presence of multiple index files, HTTP server options, and will attempt to identify installed web servers and software. Scan items and plugins are frequently updated and can be automatically updated.