Chapter 2. API Reference
//Function for starting the webserver
httpd_handle_t start_webserver(void)
{
// Generate default configuration
httpd_config_t config = HTTPD_DEFAULT_CONFIG();
// Empty handle to http_server
httpd_handle_t server = NULL;
// Start the httpd server
if (httpd_start(&server, &config) == ESP_OK) {
// Register URI handlers
httpd_register_uri_handler(server, &uri_get);
httpd_register_uri_handler(server, &uri_post);
}
// If server failed to start, handle will be NULL
return server;
}
Return
• ESP_OK : Instance created successfully
• ESP_ERR_INVALID_ARG : Null argument(s)
• ESP_ERR_HTTPD_ALLOC_MEM : Failed to allocate memory for instance
• ESP_ERR_HTTPD_TASK : Failed to launch server task
Parameters
• [in] config: Configuration for new instance of the server
• [out] handle: Handle to newly created instance of the server. NULL on error
esp_err_t httpd_stop(httpd_handle_t handle)
Stops the web server.
Deallocates memory/resources used by an HTTP server instance and deletes it. Once deleted the handle can
no longer be used for accessing the instance.
Example usage:
// Function for stopping the webserver
void stop_webserver(httpd_handle_t server)
{
// Ensure handle is non NULL
if (server != NULL) {
// Stop the httpd server
httpd_stop(server);
}
}
Return
• ESP_OK : Server stopped successfully
• ESP_ERR_INVALID_ARG : Handle argument is Null
Parameters
• [in] handle: Handle to server returned by httpd_start
esp_err_t httpd_queue_work(httpd_handle_t handle, httpd_work_fn_t work, void *arg)
Queue execution of a function in HTTPD’s context.
This API queues a work function for asynchronous execution
Note Some protocols require that the web server generate some asynchronous data and send it to the persis-
tently opened connection. This facility is for use by such protocols.
Return
• ESP_OK : On successfully queueing the work
• ESP_FAIL : Failure in ctrl socket
• ESP_ERR_INVALID_ARG : Null arguments
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