/* An HTTP PUT handler. This demonstrates realtime
* registration and deregistration of URI handlers
*/
esp_err_t ctrl_put_handler(httpd_req_t *req)
{
char buf;
int ret;
if ((ret = httpd_req_recv(req, &buf, 1)) <= 0) {
if (ret == HTTPD_SOCK_ERR_TIMEOUT) {
httpd_resp_send_408(req);
}
return ESP_FAIL;
}
if (buf == '0') {
/* Handler can be unregistered using the uri string */
ESP_LOGI(TAG, "Unregistering /hello and /echo URIs");
httpd_unregister_uri(req->handle, "/hello");
httpd_unregister_uri(req->handle, "/echo");
}
else {
ESP_LOGI(TAG, "Registering /hello and /echo URIs");
httpd_register_uri_handler(req->handle, &hello);
httpd_register_uri_handler(req->handle, &echo);
}
/* Respond with empty body */
httpd_resp_send(req, NULL, 0);
return ESP_OK;
}
/* An HTTP GET handler */
esp_err_t hello_get_handler(httpd_req_t *req)
{
char* buf;
size_t buf_len;
/* Get header value string length and allocate memory for length + 1,
* extra byte for null termination */
buf_len = httpd_req_get_hdr_value_len(req, "Host") + 1;
if (buf_len > 1) {
buf = malloc(buf_len);
/* Copy null terminated value string into buffer */
if (httpd_req_get_hdr_value_str(req, "Host", buf, buf_len) == ESP_OK) {
ESP_LOGI(TAG, "Found header => Host: %s", buf);
}
free(buf);
}
buf_len = httpd_req_get_hdr_value_len(req, "Test-Header-2") + 1;
if (buf_len > 1) {
buf = malloc(buf_len);
if (httpd_req_get_hdr_value_str(req, "Test-Header-2", buf, buf_len) == ESP_OK) {
ESP_LOGI(TAG, "Found header => Test-Header-2: %s", buf);
}
free(buf);
}
buf_len = httpd_req_get_hdr_value_len(req, "Test-Header-1") + 1;
if (buf_len > 1) {
buf = malloc(buf_len);
if (httpd_req_get_hdr_value_str(req, "Test-Header-1", buf, buf_len) == ESP_OK) {
ESP_LOGI(TAG, "Found header => Test-Header-1: %s", buf);
}
free(buf);
}
/* Read URL query string length and allocate memory for length + 1,
* extra byte for null termination */
buf_len = httpd_req_get_url_query_len(req) + 1;
if (buf_len > 1) {
buf = malloc(buf_len);
if (httpd_req_get_url_query_str(req, buf, buf_len) == ESP_OK) {
ESP_LOGI(TAG, "Found URL query => %s", buf);
char param[32];
/* Get value of expected key from query string */
if (httpd_query_key_value(buf, "query1", param, sizeof(param)) == ESP_OK) {
ESP_LOGI(TAG, "Found URL query parameter => query1=%s", param);
}
if (httpd_query_key_value(buf, "query3", param, sizeof(param)) == ESP_OK) {
ESP_LOGI(TAG, "Found URL query parameter => query3=%s", param);
}
if (httpd_query_key_value(buf, "query2", param, sizeof(param)) == ESP_OK) {
ESP_LOGI(TAG, "Found URL query parameter => query2=%s", param);
}
}
free(buf);
}
/* Set some custom headers */
httpd_resp_set_hdr(req, "Custom-Header-1", "Custom-Value-1");
httpd_resp_set_hdr(req, "Custom-Header-2", "Custom-Value-2");
/* Send response with custom headers and body set as the
* string passed in user context*/
const char* resp_str = (const char*) req->user_ctx;
httpd_resp_send(req, resp_str, strlen(resp_str));
/* After sending the HTTP response the old HTTP request
* headers are lost. Check if HTTP request headers can be read now. */
if (httpd_req_get_hdr_value_len(req, "Host") == 0) {
ESP_LOGI(TAG, "Request headers lost");
}
return ESP_OK;
}
esp_err_t httpd_resp_send_err(httpd_req_t *req, httpd_err_code_t error, const char *usr_msg)
{
esp_err_t ret;
const char *msg;
const char *status;
switch (error) {
case HTTPD_501_METHOD_NOT_IMPLEMENTED:
status = "501 Method Not Implemented";
msg = "Request method is not supported by server";
break;
case HTTPD_505_VERSION_NOT_SUPPORTED:
status = "505 Version Not Supported";
msg = "HTTP version not supported by server";
break;
case HTTPD_400_BAD_REQUEST:
status = "400 Bad Request";
msg = "Server unable to understand request due to invalid syntax";
break;
case HTTPD_404_NOT_FOUND:
status = "404 Not Found";
msg = "This URI does not exist";
break;
case HTTPD_405_METHOD_NOT_ALLOWED:
status = "405 Method Not Allowed";
msg = "Request method for this URI is not handled by server";
break;
case HTTPD_408_REQ_TIMEOUT:
status = "408 Request Timeout";
msg = "Server closed this connection";
break;
case HTTPD_414_URI_TOO_LONG:
status = "414 URI Too Long";
msg = "URI is too long for server to interpret";
break;
case HTTPD_411_LENGTH_REQUIRED:
status = "411 Length Required";
msg = "Chunked encoding not supported by server";
break;
case HTTPD_431_REQ_HDR_FIELDS_TOO_LARGE:
status = "431 Request Header Fields Too Large";
msg = "Header fields are too long for server to interpret";
break;
case HTTPD_500_INTERNAL_SERVER_ERROR:
default:
status = "500 Internal Server Error";
msg = "Server has encountered an unexpected error";
}
/* If user has provided custom message, override default message */
msg = usr_msg ? usr_msg : msg;
ESP_LOGW(TAG, LOG_FMT("%s - %s"), status, msg);
/* Set error code in HTTP response */
httpd_resp_set_status(req, status);
httpd_resp_set_type(req, HTTPD_TYPE_TEXT);
#ifdef CONFIG_HTTPD_ERR_RESP_NO_DELAY
/* Use TCP_NODELAY option to force socket to send data in buffer
* This ensures that the error message is sent before the socket
* is closed */
struct httpd_req_aux *ra = req->aux;
int nodelay = 1;
if (setsockopt(ra->sd->fd, IPPROTO_TCP, TCP_NODELAY, &nodelay, sizeof(nodelay)) < 0) {
/* If failed to turn on TCP_NODELAY, throw warning and continue */
ESP_LOGW(TAG, LOG_FMT("error calling setsockopt : %d"), errno);
nodelay = 0;
}
#endif
/* Send HTTP error message */
ret = httpd_resp_send(req, msg, strlen(msg));
#ifdef CONFIG_HTTPD_ERR_RESP_NO_DELAY
/* If TCP_NODELAY was set successfully above, time to disable it */
if (nodelay == 1) {
nodelay = 0;
if (setsockopt(ra->sd->fd, IPPROTO_TCP, TCP_NODELAY, &nodelay, sizeof(nodelay)) < 0) {
/* If failed to turn off TCP_NODELAY, throw error and
* return failure to signal for socket closure */
ESP_LOGE(TAG, LOG_FMT("error calling setsockopt : %d"), errno);
return ESP_ERR_INVALID_STATE;
}
}
#endif
return ret;
}
