request->send

[ddprog]

I can't understand why this construction doesn't compile:

webServer.on("/", HTTP_GET, [](AsyncWebServerRequest *request) {request->send(LittleFS, "index.html");});

[mathieucarbou]

What is the error ?

[ddprog]

Compiling .pio\build\esp32dev\src\main.cpp.o
src/main.cpp: In lambda function:
src/main.cpp:40:49: error: call of overloaded 'send(fs::LittleFSFS&, const char [11])' is ambiguous
             request->send(LittleFS, "index.html");
                                                 ^
In file included from src/main.cpp:4:
.pio/libdeps/esp32dev/ESPAsyncWebServer/src/ESPAsyncWebServer.h:311:10: note: candidate: 'void AsyncWebServerRequest::send(AsyncWebServerRequest::FS&, const String&, const char*, bool, AwsTemplateProcessor)'
     void send(FS& fs, const String& path, const char* contentType = asyncsrv::empty, bool download = false, AwsTemplateProcessor callback = nullptr) {
          ^~~~
.pio/libdeps/esp32dev/ESPAsyncWebServer/src/ESPAsyncWebServer.h:317:10: note: candidate: 'void AsyncWebServerRequest::send(AsyncWebServerRequest::FS&, const String&, const String&, bool, AwsTemplateProcessor)'
     void send(FS& fs, const String& path, const String& contentType = emptyString, bool download = false, AwsTemplateProcessor callback = nullptr) { send(fs, path, contentType.c_str(), download, callback); }
          ^~~~
*** [.pio\build\esp32dev\src\main.cpp.o] Error 1

[ddprog]

- framework-arduinoespressif32 @ 3.20016.0 (2.0.16)
- ESPAsyncWebServer @ 3.1.5+sha.02e233f

[mathieucarbou]

Thank! I understand the issue. This is caused following a refactoring to avoid a buffer copy when converting char* to string.

A workaround right now would be to set the content type I think as the 3rd paraleter.

[mathieucarbou]

@ddprog : I am closing this discussion and moving it to issue #79.