Fix: WebServer: Digest authentication failed for some clients

Ports: esp8266/Arduino@4d3850e

Author: me-no-dev

libraries/WebServer/src/WebServer.cpp

@@ -33,7 +33,8 @@
 
 
 static const char AUTHORIZATION_HEADER[] = "Authorization";
-static const char qop_auth[] = "qop=\"auth\"";
+static const char qop_auth[] PROGMEM = "qop=auth";
+static const char qop_auth_quoted[] PROGMEM = "qop=\"auth\"";
 static const char WWW_Authenticate[] = "WWW-Authenticate";
 static const char Content_Length[] = "Content-Length";
 
@@ -185,7 +186,7 @@ bool WebServer::authenticate(const char * username, const char * password){
       }
       // parameters for the RFC 2617 newer Digest
       String _nc,_cnonce;
-      if(authReq.indexOf(FPSTR(qop_auth)) != -1) {
+      if(authReq.indexOf(FPSTR(qop_auth)) != -1 || authReq.indexOf(FPSTR(qop_auth_quoted)) != -1) {
         _nc = _extractParam(authReq, F("nc="), ',');
         _cnonce = _extractParam(authReq, F("cnonce=\""),'\"');
       }
@@ -205,7 +206,7 @@ bool WebServer::authenticate(const char * username, const char * password){
       }
       log_v("Hash of GET:uri=%s", _H2.c_str());
       String _responsecheck = "";
-      if(authReq.indexOf(FPSTR(qop_auth)) != -1) {
+      if(authReq.indexOf(FPSTR(qop_auth)) != -1 || authReq.indexOf(FPSTR(qop_auth_quoted)) != -1) {
           _responsecheck = md5str(_H1 + ':' + _nonce + ':' + _nc + ':' + _cnonce + F(":auth:") + _H2);
       } else {
           _responsecheck = md5str(_H1 + ':' + _nonce + ':' + _H2);