Send custom HTTP requests and check your server response.
View the HTTP headers sent by your browser to the server.
Encode the plain text to Base64 or decode Base64 to the plain text.
Encode unsafe characters in URLs or decode the encoded URLs back.
Decode the ASP.NET ViewState strings and display in treeview format.
Try HTTP Debugger Desktop App
Debug HTTP API calls to the backend, see what's going in/out, investigate security and performance issues.