httpoverrpc/client: add CSRF protection to the proxy listener - #644
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The `proxy` subcommand runs a local HTTP listener that forwards requests to a remote host using the operator's ambient authorization. A page open in the operator's browser could otherwise silently drive requests through it (cross-site request forgery). Reject requests a browser marks as Sec-Fetch-Site: cross-site, and require any supplied Origin to match the listener's Host. Top-level navigation and same-origin requests are unaffected, and non-browser clients (curl, scripts) send neither header. A --skip-csrf-protection flag opts out for unusual setups.
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The
proxysubcommand runs a local HTTP listener that forwards requests to a remote host using the operator's ambient authorization. A page open in the operator's browser could otherwise silently drive requests through it (cross-site request forgery).Reject requests a browser marks as Sec-Fetch-Site: cross-site, and require any supplied Origin to match the listener's Host. Top-level navigation and same-origin requests are unaffected, and non-browser clients (curl, scripts) send neither header. A --skip-csrf-protection flag opts out for unusual setups. Also stop forwarding hop-by-hop headers to the target.