Headerly: HTTP Header Manager

Set multiple HTTP request headers on matching URLs. Organize rules, switch them on or off, and see matches per tab.

Set custom HTTP request headers on outgoing requests whose URLs contain text you choose. Headerly helps developers and QA teams test APIs and web apps across environments. Create a rule with a URL term and one or more header name/value pairs. Matching is case-insensitive and checks the request URL, including its host, path, and query string. Open, edit, enable, disable, or delete rules from a compact table. A per-tab badge shows matching request activity. Headerly saves your rules locally in Chrome and applies them with Chrome's declarative network request engine. It does not send your rules or browsing history to a Headerly server and does not use analytics. The header values you configure are attached to matching requests and sent to those destination websites. Use narrow URL terms and only use sensitive values with trusted destinations. Before saving a rule, Headerly explains that its header values will be sent with matching requests and asks you to confirm. The request URL can differ from the page shown in the address bar; an app may call an API on another host. Chrome restricts changes to some request headers. Headerly modifies outgoing request headers and does not inspect response bodies.