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Michael Heinrich
I found the solution. I had to override isRequestHandlerTrivial as well and make it return false.
Hi, is there a complimentary ESP8266 WebSocket library for ws clients? I used the library for Wemos D1 Mini as websocket server, which works great! But I want to connect to this websocket server using a second Wemos D1 Mini. Can I do this using the same library? Or is there a complimentary library?
@me-no-dev I am working on a project that uses AsyncTCP for networking.
Is there a way to disable the WDT on the Async task?
Paul Andrews
I am curious about how async TCP works on the ESP8266. In particular, do I need to be careful about concurrency issues in handlers?
Should maybe have tagged that with @me-no-dev :-)
Hello. Can we use ESPAsyncWebServer library with GSM shield in ESP32-ESP8266?
Hello guys, i have a question in terms of licensing of the „ESPAsyncWebServer“. Every other library from @me-no-dev is licensed as LGPL-3.0 or 2.0 licence, however this one has no license listed.
@me-no-dev I made a simple class from AsyncTCP but am at a loss how to set a timeout.
I have opend ESPAsyncTCP library. main class includes C-C++ "lwip" library... Can I get a result if I edit the void AsyncServer :: begin () function in the class according to AT commands?
Please can you advise to me about "Can we use ESPAsyncWebServer library with GSM shield in ESP32-ESP8266?"?
im create async web server
but refreshing and reset esp32
how to fix that
my html document

Backtrace: 0x4000c3f0:0x3ffd1380 0x400db076:0x3ffd13a0 0x400db192:0x3ffd13c0 0x400d7ad1:0x3ffd13e0 0x400d6192:0x3ffd1450 0x400d60f5:0x3ffd1490 0x400d145d:0x3ffd14b0 0x4015188f:0x3ffd14f0 0x400d9309:0x3ffd1510 0x400d6df1:0x3ffd1560 0x400d6eb5:0x3ffd15a0 0x400d7105:0x3ffd15f0 0x4014b7b1:0x3ffd1610 0x4014b82d:0x3ffd1650 0x4014bed6:0x3ffd1670 0x4008a286:0x3ffd16a0

#0 0x4000c3f0:0x3ffd1380 in ?? ??:0

#1 0x400db076:0x3ffd13a0 in String::move(String&) at C:\Users\OnurNP.platformio\packages\framework-arduinoespressif32\cores\esp32/WString.cpp:857

#2 0x400db192:0x3ffd13c0 in String::operator=(String&&) at C:\Users\OnurNP.platformio\packages\framework-arduinoespressif32\cores\esp32/WString.cpp:857

#3 0x400d7ad1:0x3ffd13e0 in AsyncBasicResponse::_respond(AsyncWebServerRequest) at lib\ESPAsyncWebServer\src/WebResponses.cpp:699

#4 0x400d6192:0x3ffd1450 in AsyncWebServerRequest::send(AsyncWebServerResponse
) at lib\ESPAsyncWebServer\src/WebRequest.cpp:797

#5 0x400d60f5:0x3ffd1490 in AsyncWebServerRequest::send(int, String const&, String const&) at lib\ESPAsyncWebServer\src/WebRequest.cpp:797

#6 0x400d145d:0x3ffd14b0 in handleRoot(AsyncWebServerRequest) at src/main.cpp:289

#7 0x4015188f:0x3ffd14f0 in std::_Function_handler<void (AsyncWebServerRequest
), void ()(AsyncWebServerRequest)>::_M_invoke(std::_Any_data const&,

AsyncWebServerRequest*&&) at c:\users\onurnp.platformio\packages\toolchain-xtensa32@2.50200.97\xtensa-esp32-elf\include\c++\5.2.0/functional:1871

#8 0x400d9309:0x3ffd1510 in std::function<void (AsyncWebServerRequest*)>::operator()(AsyncWebServerRequest*) const at lib\ESPAsyncWebServer\src/StringArray.h:73

  (inlined by) AsyncCallbackWebHandler::handleRequest(AsyncWebServerRequest*) at lib\ESPAsyncWebServer\src/WebHandlerImpl.h:132

#9 0x400d6df1:0x3ffd1560 in AsyncWebServerRequest::_parseLine() at lib\ESPAsyncWebServer\src/WebRequest.cpp:797

#10 0x400d6eb5:0x3ffd15a0 in AsyncWebServerRequest::_onData(void, unsigned int) at lib\ESPAsyncWebServer\src/WebRequest.cpp:797

#11 0x400d7105:0x3ffd15f0 in std::_Function_handler<void (void
, AsyncClient, void, unsigned int), AsyncWebServerRequest::AsyncWebServerRequest(AsyncWebServer, AsyncClient)::{lambda(void, AsyncClient, void, unsigned int)#8}>::_M_invoke(std::_Any_data const&, void&&, AsyncClient*&&, std::_Any_data const&, unsigned int&&) at lib\ESPAsyncWebServer\src/WebRequest.cpp:797

  (inlined by) _M_invoke at c:\users\onurnp\.platformio\packages\toolchain-xtensa32@2.50200.97\xtensa-esp32-elf\include\c++\5.2.0/functional:1871    

#12 0x4014b7b1:0x3ffd1610 in std::function<void (void*, AsyncClient*, void*, unsigned int)>::operator()(void, AsyncClient, void*, unsigned int) const at lib\AsyncTCP\src/AsyncTCP.cpp:1039

  (inlined by) AsyncClient::_recv(tcp_pcb*, pbuf*, signed char) at lib\AsyncTCP\src/AsyncTCP.cpp:934

#13 0x4014b82d:0x3ffd1650 in AsyncClient::_s_recv(void, tcp_pcb, pbuf, signed char) at lib\AsyncTCP\src/AsyncTCP.cpp:1039

#14 0x4014bed6:0x3ffd1670 in _async_service_task(void
) at lib\AsyncTCP\src/AsyncTCP.cpp:1039

  (inlined by) _async_service_task at lib\AsyncTCP\src/AsyncTCP.cpp:197

#15 0x4008a286:0x3ffd16a0 in vPortTaskWrapper at

/home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/freertos/port.c:355 (discriminator 1)

how to fix that help me
"I made a simple class from AsyncTCP but am at a loss how to set a timeout." : Could you tell me briefly what to do? Can I put in AT commands?
Hi!! anyone around?
im activated external interrupt and cant connect wifi
how to fix that
how do use rtos on async web server
Ramses Garcia Dilone
hello world
i tried use this lib with w5500
is possible?

Using AsyncWebServer on ESP32 I'm getting frequent Guru Meditation Errors:
Core 1 panic'ed (LoadProhibited). Exception was unhandled.
Core 1 register dump:
PC : 0x400d7e7c PS : 0x00060430 A0 : 0x800d7f1a A1 : 0x3ffb1f00
A2 : 0x3ffd31bc A3 : 0x3ffd2f84 A4 : 0x00000026 A5 : 0x3ffd2caa
A6 : 0x00000a0d A7 : 0x3a617461 A8 : 0x800d7e88 A9 : 0x3ffb1ee0
A10 : 0xe0088080 A11 : 0x00000026 A12 : 0x00000026 A13 : 0x00000026
A14 : 0x00000000 A15 : 0x00000000 SAR : 0x0000000a EXCCAUSE: 0x0000001c
EXCVADDR: 0xe0088088 LBEG : 0x4000c2e0 LEND : 0x4000c2f6 LCOUNT : 0xffffffff

ELF file SHA256: 0000000000000000

Backtrace: 0x400d7e7c:0x3ffb1f00 0x400d7f17:0x3ffb1f20 0x400d7f37:0x3ffb1f40 0x400d7f8d:0x3ffb1f60 0x400d17d3:0x3ffb1f90 0x400df329:0x3ffb1fb0 0x40089afa:0x3ffb1fd0

the backtrace shows
Decoding 7 results
0x400d7e7c: AsyncEventSourceClient::_runQueue() at c:\arduinoideportable\portable\packages\esp32\tools\xtensa-esp32-elf-gcc\1.22.0-97-gc752ad5-5.2.0\xtensa-esp32-elf\include\c++\5.2.0/functional line 1858
0x400d7f17: AsyncEventSourceClient::_queueMessage(AsyncEventSourceMessage) at c:\arduinoideportable\portable\packages\esp32\tools\xtensa-esp32-elf-gcc\1.22.0-97-gc752ad5-5.2.0\xtensa-esp32-elf\include\c++\5.2.0/functional line 1858
0x400d7f37: AsyncEventSourceClient::write(char const
, unsigned int) at c:\arduinoideportable\portable\packages\esp32\tools\xtensa-esp32-elf-gcc\1.22.0-97-gc752ad5-5.2.0\xtensa-esp32-elf\include\c++\5.2.0/functional line 1858
0x400d7f8d: AsyncEventSource::send(char const, char const, unsigned int, unsigned int) at c:\arduinoideportable\portable\packages\esp32\tools\xtensa-esp32-elf-gcc\1.22.0-97-gc752ad5-5.2.0\xtensa-esp32-elf\include\c++\5.2.0/functional line 1858
0x400d17d3: loop() at C:\ArduinoIDEPortable\portable\sketchbook\ESP32\SolarLoggerJune12/SolarLoggerJune12.ino line 151
0x400df329: loopTask(void*) at C:\ArduinoIDEPortable\portable\packages\esp32\hardware\esp32\1.0.6\cores\esp32/main.cpp line 23
0x40089afa: vPortTaskWrapper at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/freertos/port.c line 355 (discriminator 1)

referring to this line in my code

151: events.send( mycWatts , "cwatts", millis());

It doesntt happen every time but its realy giving me a headache. Any ideas?

Rolf Wedermann
Hello everyone, will the ESP Async web server be further developed or is the project idle?
Seems idle
Tom Sciano
how can I send a fetch/post request to itself using javascript
i keep getting a cors error
` const button = document.getElementById("post-btn");
    button.addEventListener("click", async(_) => {
        try {
            const response = await fetch("board", {
                method: "post",
                body: {
            console.log("Completed!", response);
        } catch (err) {
            console.error(`Error: ${err}`);
    }); `
Tom Sciano
+and this is how my post starts
AsyncCallbackJsonWebHandler *handler = new AsyncCallbackJsonWebHandler("/board", [](AsyncWebServerRequest *request, JsonVariant &json) {
also tried with adding this before server begin
DefaultHeaders::Instance().addHeader("Access-Control-Allow-Origin", "*"); DefaultHeaders::Instance().addHeader("Access-Control-Allow-Headers", "Content-Type");
Re my message above I have found that my code is much more stable - ie less frequent guru errors - with a delay between events.send calls.
I've implemented this with a state machine and have not had a guru error in 24 hours continuous running (but there is time yet!)

I'm trying to let ESPAsynchWebServer on an ESP32 serve all JPG-Images in SPIFFS as follows:

server->on("^(([/|.|\w|\s])*)\.jpg$", HTTP_GET, [] (AsyncWebServerRequest *request) { String name = request->pathArg(0) + ".jpg"; request->send(SPIFFS, name, "image/jpg"); });

Unfortunatel, it never serves the images.

I added compiler.cpp.extra_flags=-DDASYNCWEBSERVER_REGEX to platforms.local.txt
The files are called like «aed3.jpg» oder «bcd.jpg».
If anyone sees how I sould change the regex to mach my needs, please help me.

Thank you very much, Dani

@ld21 Have you tried the server.serveStatic setup? I have used that for some time now and find it the best way to serve files. You should be able to just serve the files from a specific directory (I have not tried, I always use the root directory), and you could put your .jpg in there. See here for an example usage in one of my projects: https://github.com/sillyfrog/PrettyLights2/blob/bbed6c986609ad2b17e7be4eaa7f512c87c81b75/src/main.cpp#L839 (this code allows you to change between LittleFS and SPIFFS - now SPIFFS is EOL I would suggest moving to LittleFS for a new project).
@sillyfrog Great ideas, thanks a lot – I think they will solve my problems in a very elegant way. And thanks for pointing out LittleFS, I havent's heard of it so far and it really seems to be the future of ESP32-FSs.
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I am running the interface on the local server using the asyncy web server library. no problem here

but 2 or more esp32s are connecting to each other, the server esp32 needs to send data to the client esp32, for this they need to send data between themselves via http post. How can I do this?

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Pavel Baranov
guys, does anyone tried to use ESP32 miniz lib to compress files on sd card?
maybe someone can provide a simple working example?
Sloata George

Are there any examples of dynamic web pages using ESPAsyncWebServer ?
I would like to GET and POST data without having to reload the page every time.

Right now each request ends with redirect which reloads the page:

  server.on("/settings", HTTP_POST, [](AsyncWebServerRequest *request)
              if (request->hasArg("save_output"))
                // do something with the received data

But request->redirect("/settings"); reloads the page.
Can I change this behavior ?

Hi I am new to programing and Arduino can you please anyone help me out I'm stuck on this error code :
C:\Users----\Documents\Arduino\libraries\ESPAsyncTCP-master\src\SyncClient.cpp:25:24: fatal error: interrupts.h: No such file or directory
compilation terminated.
exit status 1
Error compiling for board ESP32 Dev Module.
This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.
I downloaded * ArduinoJson (Request Pool Version 2.6)
What did I not include or configure?
I'm using a ESP32s wroom board 38pin. Sorry if I seem to be spamming I'm just trying to include the information needed to complete compilation and understand the libraries for the sketch to verify so I can then upload.
Mick Percy

@GeorgeFlorian you need to exchange data between server and client using websockets. This means you need to create your own protocols for exchanging data and updating the DOM.

I'm currently doing this on a project that I am working on... https://github.com/DeeEmm/DIY-Flow-Bench/tree/ESP32

The way that I have done this is that both the browser and ESP32 have websocket listen events. I'm exchanging JSON data and adding a header value to each JSON object before transmission. The header acts as a simple protocol to let the receiving side know what to do. When websocket data is received the JSON 'header' value is decoded and the relevant action taken. Some transmissions only have a header value, others have the header value with additional data. This data exchange is both bidirectional and asynchronous so falls outside of the main loop.

On the browser side you can update the DOM using simple document.getElementById statements

Check out the index.html / javascript.js files for the client implementation and the Webserver::ProcessWebSocketMessage method in Webserver.cpp for the ESP side.

For an example of the JSON data I am using take a look in data/config.json

Using JSON makes the data exchange nice and easy on both sides as there are already tools available for both the browser (native javascript) and ESP32 (ArduinoJson library) to manage JSON data objects. It also makes storing configuration data in SPIFFS nice and easy too.

There is one caveat to this - file uploads - Traditionally they are handled via POST vars and require a navigation event (file / form submit) to transmit them. HTML5 does have a transport method that does not require this but I have not played with it (yet) so cannot comment. However it appears that this method is not backwards compatible in older browsers.