ehttpd is a simple http server runs on ESP32 device. It only uses about 20K static allocated memory and Ragel generated state machine for URL routing. picohttpparser is used for HTTP header parsing. uriparser for http request path parsing. it also can be compiled to a host side simple http server for testing purpose.

It uses ESP32-IDF to build and flash, please follow ESP-IDF Programming Guide to setup toolchain and build environment, make sure you can build hello world project by following Start a Project

Ragel is used to auto-generate C files, please install it

sudo apt install ragel

or build from scratch

wget http://www.colm.net/files/ragel/ragel-6.10.tar.gz
tar xpf ragel-6.10.tar.gz
./configure --prefix=/usr/local
make
sudo make install

get the code:

git clone https://github.com/DavidPu/ehttpd.git $IDF_PATH/ehttpd

config the ehttpd:

cd $IDF_PATH/ehttpd
make menuconfig
# select your ESP32 USB serial port. make sure it can be read/write without sudo permission
# Serial flasher config
    # (/dev/ttyUSB0) default serial port
    # Flash size ---> 4M
# Example Configuration
  # setup your WIFI SSID and WiFIi password ESP32 board will connect to.

build and flash basic hello world echo server:

cd $IDF_PATH/ehttpd
make ehttpd_gen_c flash

ehttpd includes a Makefile.blockly.spiffs Makefile to build a complete Google Blockly-Games/maze web application and run on ESP-32. Run beow commands to build all related images and flash to ESP32 board:

sudo apt install zopfli
make -f Makefile.blockly.spiffs