Tpl engine now accepts %% as an escape for %

user/httpdespfs.c

@@ -124,8 +124,15 @@ int ICACHE_FLASH_ATTR cgiEspFsTemplate(HttpdConnData *connData) {
 				}
 			} else {
 				if (buff[x]=='%') {
-					tpd->token[tpd->tokenPos++]=0; //zero-terminate token
-					((TplCallback)(connData->cgiArg))(connData, tpd->token, &tpd->tplArg);
+					if (tpd->tokenPos==0) {
+						//This is the second % of a %% escape string.
+						//Send a single % and resume with the normal program flow.
+						espconn_sent(connData->conn, (uint8 *)"%", 1);
+					} else {
+						//This is an actual token.
+						tpd->token[tpd->tokenPos++]=0; //zero-terminate token
+						((TplCallback)(connData->cgiArg))(connData, tpd->token, &tpd->tplArg);
+					}
 					//Go collect normal chars again.
 					e=&buff[x+1];
 					tpd->tokenPos=-1;