Check HTTP Status Codes, SSL Validation, WWW Authentication, Redirects, Access Control, Cache Control, Content Encoding, Cookie Data and more...
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Modify Header Value (HTTP Headers) - Modify Header Value (HTTP Headers) is a browser extension that allows you to add, modify or remove a header for any request to your preferred domains.
ViewHTTPHeaders.com - View HTTP header response for any web page.
WebSniffer - WebSniffer is an online tool to outlook HTTP request and response headers.
HTTP Header Live - Displays the HTTP header. Edit it and send it.
HTTP-Repeater (HTTP/s Live Headers) (Beta) - HTTP-Repeater (HTTP/s Live Headers) (Beta) is a browser extension that lets you capture browser requests and repeat the process in a loop automatically.
Fiddler - Fiddler is a debugging program for websites.