AsyncResponseStream: Use TCP_MSS as default size

Author: willmmiles

src/ESPAsyncWebServer.h

@@ -249,7 +249,7 @@ class AsyncWebServerRequest {
     AsyncWebServerResponse *beginResponse(Stream &stream, const String& contentType, size_t len, AwsTemplateProcessor callback=nullptr);
     AsyncWebServerResponse *beginResponse(const String& contentType, size_t len, AwsResponseFiller callback, AwsTemplateProcessor templateCallback=nullptr);
     AsyncWebServerResponse *beginChunkedResponse(const String& contentType, AwsResponseFiller callback, AwsTemplateProcessor templateCallback=nullptr);
-    AsyncResponseStream *beginResponseStream(const String& contentType, size_t bufferSize=1460);
+    AsyncResponseStream *beginResponseStream(const String& contentType, size_t bufferSize=TCP_MSS);
     AsyncWebServerResponse *beginResponse_P(int code, const String& contentType, const uint8_t * content, size_t len, AwsTemplateProcessor callback=nullptr);
     AsyncWebServerResponse *beginResponse_P(int code, const String& contentType, PGM_P content, AwsTemplateProcessor callback=nullptr);
 

src/WebResponseImpl.h

@@ -125,7 +125,7 @@ class AsyncResponseStream: public AsyncAbstractResponse, public Print {
     DynamicBufferListPrint _print;
     size_t _offset;
   public:
-    AsyncResponseStream(const String& contentType, size_t bufferSize);
+    AsyncResponseStream(const String& contentType, size_t bufferSize=TCP_MSS);
     ~AsyncResponseStream();
     bool _sourceValid() const { return (_state < RESPONSE_END); }
     virtual size_t _fillBuffer(uint8_t *buf, size_t maxLen) override;