improve handling of non http servers

Author: Links2004

libraries/ESP8266httpClient/src/ESP8266httpClient.cpp

@@ -386,6 +386,9 @@ int httpClient::handleHeaderResponse() {
         return HTTPC_ERROR_NOT_CONNECTED;
     }
 
+    _returnCode = -1;
+    _size = -1;
+
     while(connected()) {
         size_t len = _tcp->available();
         if(len > 0) {
@@ -421,7 +424,12 @@ int httpClient::handleHeaderResponse() {
                 if(_size) {
                     DEBUG_HTTPCLIENT("[HTTP-Client][handleHeaderResponse] size: %d\n", _size);
                 }
-                return _returnCode;
+                if(_returnCode) {
+                    return _returnCode;
+                } else {
+                    DEBUG_HTTPCLIENT("[HTTP-Client][handleHeaderResponse] Remote host is not an HTTP Server!");
+                    return HTTPC_ERROR_NO_HTTP_SERVER;
+                }
             }
 
         } else {

libraries/ESP8266httpClient/src/ESP8266httpClient.h

@@ -40,6 +40,7 @@
 #define HTTPC_ERROR_NOT_CONNECTED       (-4)
 #define HTTPC_ERROR_CONNECTION_LOST     (-5)
 #define HTTPC_ERROR_NO_STREAM           (-6)
+#define HTTPC_ERROR_NO_HTTP_SERVER      (-7)
 
 
 class httpClient {