ESP8266WebServer: save RAM by moving response strings to flash (#1732)

Author: igrr

libraries/ESP8266WebServer/src/ESP8266WebServer.cpp

@@ -373,7 +373,7 @@ void ESP8266WebServer::sendContent_P(PGM_P content, size_t size) {
 
 String ESP8266WebServer::arg(String name) {
   for (int i = 0; i < _currentArgCount; ++i) {
-    if ( _currentArgs[i].key == name ) 
+    if ( _currentArgs[i].key == name )
       return _currentArgs[i].value;
   }
   return String();
@@ -487,48 +487,48 @@ void ESP8266WebServer::_handleRequest() {
   _currentUri = String();
 }
 
-const char* ESP8266WebServer::_responseCodeToString(int code) {
+String ESP8266WebServer::_responseCodeToString(int code) {
   switch (code) {
-    case 100: return "Continue";
-    case 101: return "Switching Protocols";
-    case 200: return "OK";
-    case 201: return "Created";
-    case 202: return "Accepted";
-    case 203: return "Non-Authoritative Information";
-    case 204: return "No Content";
-    case 205: return "Reset Content";
-    case 206: return "Partial Content";
-    case 300: return "Multiple Choices";
-    case 301: return "Moved Permanently";
-    case 302: return "Found";
-    case 303: return "See Other";
-    case 304: return "Not Modified";
-    case 305: return "Use Proxy";
-    case 307: return "Temporary Redirect";
-    case 400: return "Bad Request";
-    case 401: return "Unauthorized";
-    case 402: return "Payment Required";
-    case 403: return "Forbidden";
-    case 404: return "Not Found";
-    case 405: return "Method Not Allowed";
-    case 406: return "Not Acceptable";
-    case 407: return "Proxy Authentication Required";
-    case 408: return "Request Time-out";
-    case 409: return "Conflict";
-    case 410: return "Gone";
-    case 411: return "Length Required";
-    case 412: return "Precondition Failed";
-    case 413: return "Request Entity Too Large";
-    case 414: return "Request-URI Too Large";
-    case 415: return "Unsupported Media Type";
-    case 416: return "Requested range not satisfiable";
-    case 417: return "Expectation Failed";
-    case 500: return "Internal Server Error";
-    case 501: return "Not Implemented";
-    case 502: return "Bad Gateway";
-    case 503: return "Service Unavailable";
-    case 504: return "Gateway Time-out";
-    case 505: return "HTTP Version not supported";
+    case 100: return F("Continue");
+    case 101: return F("Switching Protocols");
+    case 200: return F("OK");
+    case 201: return F("Created");
+    case 202: return F("Accepted");
+    case 203: return F("Non-Authoritative Information");
+    case 204: return F("No Content");
+    case 205: return F("Reset Content");
+    case 206: return F("Partial Content");
+    case 300: return F("Multiple Choices");
+    case 301: return F("Moved Permanently");
+    case 302: return F("Found");
+    case 303: return F("See Other");
+    case 304: return F("Not Modified");
+    case 305: return F("Use Proxy");
+    case 307: return F("Temporary Redirect");
+    case 400: return F("Bad Request");
+    case 401: return F("Unauthorized");
+    case 402: return F("Payment Required");
+    case 403: return F("Forbidden");
+    case 404: return F("Not Found");
+    case 405: return F("Method Not Allowed");
+    case 406: return F("Not Acceptable");
+    case 407: return F("Proxy Authentication Required");
+    case 408: return F("Request Time-out");
+    case 409: return F("Conflict");
+    case 410: return F("Gone");
+    case 411: return F("Length Required");
+    case 412: return F("Precondition Failed");
+    case 413: return F("Request Entity Too Large");
+    case 414: return F("Request-URI Too Large");
+    case 415: return F("Unsupported Media Type");
+    case 416: return F("Requested range not satisfiable");
+    case 417: return F("Expectation Failed");
+    case 500: return F("Internal Server Error");
+    case 501: return F("Not Implemented");
+    case 502: return F("Bad Gateway");
+    case 503: return F("Service Unavailable");
+    case 504: return F("Gateway Time-out");
+    case 505: return F("HTTP Version not supported");
     default:  return "";
   }
 }

libraries/ESP8266WebServer/src/ESP8266WebServer.h

@@ -134,7 +134,7 @@ template<typename T> size_t streamFile(T &file, const String& contentType){
   void _handleRequest();
   bool _parseRequest(WiFiClient& client);
   void _parseArguments(String data);
-  static const char* _responseCodeToString(int code);
+  static String _responseCodeToString(int code);
   bool _parseForm(WiFiClient& client, String boundary, uint32_t len);
   bool _parseFormUploadAborted();
   void _uploadWriteByte(uint8_t b);