Passing custom HTTPClient to HTTPUpdate (#8773)

This enables passing additional headers to HTTP query.
Based on ESP32 HTTPUpdate functionalities.

Author: BackLogers

libraries/ESP8266httpUpdate/src/ESP8266httpUpdate.cpp

@@ -83,6 +83,16 @@ HTTPUpdateResult ESP8266HTTPUpdate::update(WiFiClient& client, const String& hos
     return handleUpdate(http, currentVersion, false);
 }
 
+HTTPUpdateResult ESP8266HTTPUpdate::update(HTTPClient& httpClient, const String& currentVersion)
+{
+    return handleUpdate(httpClient, currentVersion, false);
+}
+
+HTTPUpdateResult ESP8266HTTPUpdate::updateFS(HTTPClient& httpClient, const String& currentVersion)
+{
+    return handleUpdate(httpClient, currentVersion, true);
+}
+
 /**
  * return error code as int
  * @return int error code

libraries/ESP8266httpUpdate/src/ESP8266httpUpdate.h

@@ -120,7 +120,9 @@ class ESP8266HTTPUpdate
     t_httpUpdate_return update(WiFiClient& client, const String& host, uint16_t port, const String& uri = "/",
                                const String& currentVersion = "");
     t_httpUpdate_return updateFS(WiFiClient& client, const String& url, const String& currentVersion = "");
-
+    t_httpUpdate_return update(HTTPClient& httpClient, const String& currentVersion = "");
+    t_httpUpdate_return updateFS(HTTPClient& httpClient, const String& currentVersion = "");
+    
     // Notification callbacks
     void onStart(HTTPUpdateStartCB cbOnStart)          { _cbStart = cbOnStart; }
     void onEnd(HTTPUpdateEndCB cbOnEnd)                { _cbEnd = cbOnEnd; }