Revert "fix CORS headers"

This reverts commit fe83bd5b71.

.gitignore

@@ -87,7 +87,6 @@ node_modules/**
 !.gitignore
 !version
 !out.jsonl
-!Dockerfile*
 # ...even if they are in subdirectories
 !*/
 /blocklist.json

main.go

@@ -478,14 +478,6 @@ func setProxy(mapping map[string]string) (http.Handler, error) {
 				rp := newSingleHostReverseProxy(u)
 				rp.ErrorLog = log2.New(io.Discard, "", 0)
 				rp.BufferPool = bufPool{}
-				rp.ModifyResponse = func(resp *http.Response) error {
-					// Add CORS headers to all proxied responses
-					resp.Header.Set("Access-Control-Allow-Origin", "*")
-					resp.Header.Set("Access-Control-Allow-Methods", "GET, POST, OPTIONS")
-					resp.Header.Set("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, Authorization, Upgrade, Connection, Sec-WebSocket-Key, Sec-WebSocket-Version, Sec-WebSocket-Protocol, Sec-WebSocket-Extensions")
-					resp.Header.Set("Access-Control-Max-Age", "86400")
-					return nil
-				}
 				mux.Handle(hn+"/", rp)
 				addFaviconHandler(hn, mux)
 				continue
@@ -508,14 +500,6 @@ func setProxy(mapping map[string]string) (http.Handler, error) {
 					return net.DialTimeout(network, ba, 5*time.Second)
 				},
 			},
-			ModifyResponse: func(resp *http.Response) error {
-				// Add CORS headers to all proxied responses
-				resp.Header.Set("Access-Control-Allow-Origin", "*")
-				resp.Header.Set("Access-Control-Allow-Methods", "GET, POST, OPTIONS")
-				resp.Header.Set("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, Authorization, Upgrade, Connection, Sec-WebSocket-Key, Sec-WebSocket-Version, Sec-WebSocket-Protocol, Sec-WebSocket-Extensions")
-				resp.Header.Set("Access-Control-Max-Age", "86400")
-				return nil
-			},
 			ErrorLog:   log2.New(os.Stderr, "reverse", 0),
 			BufferPool: bufPool{},
 		}