begin refactor of proxy engine

proxychain/rsm/bypass_cors.go

@@ -0,0 +1,20 @@
+package rsm // ReSponseModifers
+
+import (
+	"ladder/proxychain"
+)
+
+// BypassCORs modifies response headers to prevent the browser
+// from enforcing any CORS restrictions
+func BypassCORS() proxychain.ResponseModification {
+	return func(px *proxychain.ProxyChain) error {
+		px.AddResultModifications(
+			ModifyResponseHeader("Access-Control-Allow-Origin", "*"),
+			ModifyResponseHeader("Access-Control-Expose-Headers", "*"),
+			ModifyResponseHeader("Access-Control-Allow-Credentials", "true"),
+			ModifyResponseHeader("Access-Control-Allow-Methods", "GET, PUT, POST, DELETE, HEAD, OPTIONS, PATCH"),
+			DeleteResponseHeader("X-Frame-Options"),
+		)
+		return nil
+	}
+}