| Supported Targets | ESP32 | ESP32-S2 | ESP32-S3 | ESP32-C3 | | ----------------- | ----- | -------- | -------- | -------- | # Simple HTTPD Server Example The Example consists of HTTPD server demo with demostration of URI handling : 1. URI \hello for GET command returns "Hello World!" message 2. URI \echo for POST command echoes back the POSTed message ## How to use example ### Hardware Required * A development board with ESP32/ESP32-S2/ESP32-C3 SoC (e.g., ESP32-DevKitC, ESP-WROVER-KIT, etc.) * A USB cable for power supply and programming ### Configure the project ``` idf.py menuconfig ``` * Open the project configuration menu (`idf.py menuconfig`) to configure Wi-Fi or Ethernet. See "Establishing Wi-Fi or Ethernet Connection" section in [examples/protocols/README.md](../../README.md) for more details. ### Build and Flash Build the project and flash it to the board, then run monitor tool to view serial output: ``` idf.py -p PORT flash monitor ``` (Replace PORT with the name of the serial port to use.) (To exit the serial monitor, type ``Ctrl-]``.) See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects. ### Test the example : * run the test script : "python scripts/client.py \ \ \" * the provided test script first does a GET \hello and displays the response * the script does a POST to \echo with the user input \ and displays the response * or use curl (asssuming IP is 192.168.43.130): 1. "curl 192.168.43.130:80/hello" - tests the GET "\hello" handler 2. "curl -X POST --data-binary @anyfile 192.168.43.130:80/echo > tmpfile" * "anyfile" is the file being sent as request body and "tmpfile" is where the body of the response is saved * since the server echoes back the request body, the two files should be same, as can be confirmed using : "cmp anyfile tmpfile" 3. "curl -X PUT -d "0" 192.168.43.130:80/ctrl" - disable /hello and /echo handlers 4. "curl -X PUT -d "1" 192.168.43.130:80/ctrl" - enable /hello and /echo handlers ## Example Output ``` I (9580) example_connect: - IPv4 address: 192.168.194.219 I (9580) example_connect: - IPv6 address: fe80:0000:0000:0000:266f:28ff:fe80:2c74, type: ESP_IP6_ADDR_IS_LINK_LOCAL I (9590) example: Starting server on port: '80' I (9600) example: Registering URI handlers I (66450) example: Found header => Host: 192.168.194.219 I (66460) example: Request headers lost ``` ## Troubleshooting * If the server log shows "httpd_parse: parse_block: request URI/header too long", especially when handling POST requests, then you probably need to increase HTTPD_MAX_REQ_HDR_LEN, which you can find in the project configuration menu (`idf.py menuconfig`): Component config -> HTTP Server -> Max HTTP Request Header Length