add function to get (request | form) argument values

http_server.c

@@ -384,6 +384,17 @@ int http_request_get_method(http_context_t ctx)
     return (int) ctx->parser.method;
 }
 
+const char* http_request_get_arg_value(http_context_t ctx, const char* name)
+{
+    http_header_t* it;
+    SLIST_FOREACH(it, &ctx->request_args, list_entry) {
+        if (strcasecmp(name, it->name) == 0) {
+            return it->value;
+        }
+    }
+    return NULL;
+}
+
 esp_err_t http_request_get_data(http_context_t ctx, const char** out_data_ptr, size_t* out_size)
 {
     if (ctx->event != HTTP_HANDLE_DATA) {

http_server.h

@@ -131,12 +131,12 @@ esp_err_t http_register_form_handler(http_server_t server, const char* uri_patte
                                     int events, http_handler_fn_t callback, void* callback_arg);
 
 /**
- * @brief Get value for given form item name
+ * @brief Get value for given URL argument of form argument
  * @param http_ctx  context passed to the handler
- * @param name  name of form item
- * @return  pointer to the form item value, valid until the end of request
+ * @param name  name of URL or form argument
+ * @return  pointer to the value, valid until the end of request
  */
-const char* http_request_get_form_value(http_context_t http_ctx, const char* name);
+const char* http_request_get_arg_value(http_context_t http_ctx, const char* name);
 
 /**
  * @brief Get request method