Add ESP8266WebServerTemplate<ServerType>::enableCORS(bool _ec) (#7388)

Add ESP8266WebServerTemplate<ServerType>::enableCORS(bool _ec) like ESP32 Arduino platform.

Author: Mjxkill

libraries/ESP8266WebServer/src/ESP8266WebServer-impl.h

@@ -20,7 +20,6 @@
   Modified 8 May 2015 by Hristo Gochkov (proper post and file upload handling)
 */
 
-
 #include <Arduino.h>
 #include <libb64/cencode.h>
 #include "WiFiServer.h"
@@ -61,6 +60,7 @@ ESP8266WebServerTemplate<ServerType>::ESP8266WebServerTemplate(IPAddress addr, i
 , _currentHeaders(nullptr)
 , _contentLength(0)
 , _chunked(false)
+, _corsEnabled(false)
 {
 }
 
@@ -82,6 +82,7 @@ ESP8266WebServerTemplate<ServerType>::ESP8266WebServerTemplate(int port)
 , _currentHeaders(nullptr)
 , _contentLength(0)
 , _chunked(false)
+, _corsEnabled(false)
 {
 }
 
@@ -98,6 +99,10 @@ ESP8266WebServerTemplate<ServerType>::~ESP8266WebServerTemplate() {
   }
 }
 
+template <typename ServerType>
+void ESP8266WebServerTemplate<ServerType>::enableCORS(bool enable) {
+  _corsEnabled = enable;
+}
 template <typename ServerType>
 void ESP8266WebServerTemplate<ServerType>::begin() {
   close();
@@ -421,6 +426,9 @@ void ESP8266WebServerTemplate<ServerType>::_prepareHeader(String& response, int
       sendHeader(String(F("Accept-Ranges")),String(F("none")));
       sendHeader(String(F("Transfer-Encoding")),String(F("chunked")));
     }
+    if (_corsEnabled) {
+      sendHeader(String(F("Access-Control-Allow-Origin")), String("*"));
+    }
     sendHeader(String(F("Connection")), String(F("close")));
 
     response += _responseHeaders;

libraries/ESP8266WebServer/src/ESP8266WebServer.h

@@ -99,6 +99,7 @@ class ESP8266WebServerTemplate
   void serveStatic(const char* uri, fs::FS& fs, const char* path, const char* cache_header = NULL );
   void onNotFound(THandlerFunction fn);  //called when handler is not assigned
   void onFileUpload(THandlerFunction fn); //handle file uploads
+  void enableCORS(bool enable);
 
   const String& uri() const { return _currentUri; }
   HTTPMethod method() const { return _currentMethod; }
@@ -244,11 +245,14 @@ class ESP8266WebServerTemplate
 
   String           _hostHeader;
   bool             _chunked;
+  bool             _corsEnabled;
 
   String           _snonce;  // Store noance and opaque for future comparison
   String           _sopaque;
   String           _srealm;  // Store the Auth realm between Calls
 
+  
+
 };