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fix: strip Proxy-Authorization header on cross-origin redirects - #1870
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Fixes #1869
When following redirects across different origins (e.g. 301, 302, 303, 307, 308), superagent strips
AuthorizationandCookieheaders to prevent credential leakage. However,Proxy-Authorizationwas retained and forwarded to third-party redirect origins.Changes
proxy-authorizationalongsideauthorizationandcookieinutils.cleanHeaderwhenchangesOriginis true.proxy-authorizationin_redirectfor 307/308 redirects whenchangesOriginis true.proxy-authorizationon same-origin redirects.Proxy-Authorization.