diff --git a/cores/esp8266/Esp.cpp b/cores/esp8266/Esp.cpp
index ed174b5a0..a2ecd4efe 100644
--- a/cores/esp8266/Esp.cpp
+++ b/cores/esp8266/Esp.cpp
@@ -280,6 +280,8 @@ uint32_t EspClass::getFlashChipSizeByChipId(void) {
             return (2_MB);
         case 0x1440EF: // W25Q80
             return (1_MB);
+        case 0x1340EF: // W25Q40
+            return (512_kB);
 
         default:
             return 0;
diff --git a/libraries/ESP8266WebServer/src/ESP8266WebServer.cpp b/libraries/ESP8266WebServer/src/ESP8266WebServer.cpp
index 75474ae70..08416382c 100644
--- a/libraries/ESP8266WebServer/src/ESP8266WebServer.cpp
+++ b/libraries/ESP8266WebServer/src/ESP8266WebServer.cpp
@@ -159,11 +159,22 @@ void ESP8266WebServer::send_P(int code, PGM_P content_type, PGM_P content) {
     }
 
     String header;
-    _prepareHeader(header, code, String(FPSTR(content_type)).c_str(), contentLength);
+    char type[64];
+    memccpy_P((void*)type, (PGM_VOID_P)content_type, 0, sizeof(type));
+    _prepareHeader(header, code, (const char* )type, contentLength);
     sendContent(header);
     sendContent_P(content);
 }
 
+void ESP8266WebServer::send_P(int code, PGM_P content_type, PGM_P content, size_t contentLength) {
+    String header;
+    char type[64];
+    memccpy_P((void*)type, (PGM_VOID_P)content_type, 0, sizeof(type));
+    _prepareHeader(header, code, (const char* )type, contentLength);
+    sendContent(header);
+    sendContent_P(content, contentLength);
+}
+
 void ESP8266WebServer::send(int code, char* content_type, const String& content) {
   send(code, (const char*)content_type, content);
 }
@@ -216,6 +227,26 @@ void ESP8266WebServer::sendContent_P(PGM_P content) {
     }
 }
 
+void ESP8266WebServer::sendContent_P(PGM_P content, size_t size) {
+    char contentUnit[HTTP_DOWNLOAD_UNIT_SIZE + 1];
+    contentUnit[HTTP_DOWNLOAD_UNIT_SIZE] = '\0';
+    size_t remaining_size = size;
+
+    while (content != NULL && remaining_size > 0) {
+        size_t contentUnitLen = HTTP_DOWNLOAD_UNIT_SIZE;
+
+        if (remaining_size < HTTP_DOWNLOAD_UNIT_SIZE) contentUnitLen = remaining_size;
+        // due to the memcpy signature, lots of casts are needed
+        memcpy_P((void*)contentUnit, (PGM_VOID_P)content, contentUnitLen);
+
+        content += contentUnitLen;
+        remaining_size -= contentUnitLen;
+
+        // write is so overloaded, had to use the cast to get it pick the right one
+        _currentClient.write((const char*)contentUnit, contentUnitLen);
+    }
+}
+
 String ESP8266WebServer::arg(const char* name) {
   for (int i = 0; i < _currentArgCount; ++i) {
     if (_currentArgs[i].key == name)
diff --git a/libraries/ESP8266WebServer/src/ESP8266WebServer.h b/libraries/ESP8266WebServer/src/ESP8266WebServer.h
index 33b7b8401..fad9fc55c 100644
--- a/libraries/ESP8266WebServer/src/ESP8266WebServer.h
+++ b/libraries/ESP8266WebServer/src/ESP8266WebServer.h
@@ -90,11 +90,13 @@ public:
   void send(int code, char* content_type, const String& content);
   void send(int code, const String& content_type, const String& content);
   void send_P(int code, PGM_P content_type, PGM_P content);
+  void send_P(int code, PGM_P content_type, PGM_P content, size_t contentLength);
 
   void setContentLength(size_t contentLength) { _contentLength = contentLength; }
   void sendHeader(const String& name, const String& value, bool first = false);
   void sendContent(const String& content);
   void sendContent_P(PGM_P content);
+  void sendContent_P(PGM_P content, size_t size);
 
 template<typename T> size_t streamFile(T &file, const String& contentType){
   setContentLength(file.size());
diff --git a/libraries/ESP8266WiFi/src/WiFiClient.cpp b/libraries/ESP8266WiFi/src/WiFiClient.cpp
index 8165ba3ba..d881c4a87 100644
--- a/libraries/ESP8266WiFi/src/WiFiClient.cpp
+++ b/libraries/ESP8266WiFi/src/WiFiClient.cpp
@@ -186,24 +186,19 @@ size_t WiFiClient::write_P(PGM_P buf, size_t size)
 
     char chunkUnit[WIFICLIENT_MAX_PACKET_SIZE + 1];
     chunkUnit[WIFICLIENT_MAX_PACKET_SIZE] = '\0';
-    while (buf != NULL) 
-    {
-        size_t chunkUnitLen;
-        PGM_P chunkNext;
-        chunkNext = (PGM_P)memccpy_P((void*)chunkUnit, (PGM_VOID_P)buf, 0, WIFICLIENT_MAX_PACKET_SIZE);
-        if (chunkNext == NULL) 
-        {
-            // no terminator, more data available
-            buf += WIFICLIENT_MAX_PACKET_SIZE;
-            chunkUnitLen = WIFICLIENT_MAX_PACKET_SIZE;
-        }
-        else 
-        {
-            // reached terminator
-            chunkUnitLen = chunkNext - buf;
-            buf = NULL;
-        }
-        if (size < WIFICLIENT_MAX_PACKET_SIZE) chunkUnitLen = size;
+    size_t remaining_size = size;
+
+    while (buf != NULL && remaining_size > 0) {
+        size_t chunkUnitLen = WIFICLIENT_MAX_PACKET_SIZE;
+
+        if (remaining_size < WIFICLIENT_MAX_PACKET_SIZE) chunkUnitLen = remaining_size;
+        // due to the memcpy signature, lots of casts are needed
+        memcpy_P((void*)chunkUnit, (PGM_VOID_P)buf, chunkUnitLen);
+
+        buf += chunkUnitLen;
+        remaining_size -= chunkUnitLen;
+
+        // write is so overloaded, had to use the cast to get it pick the right one
         _client->write((const char*)chunkUnit, chunkUnitLen);
     }
     return size;