Make the UserAgent string in esp-http-client configurable

Signed-off-by: Shubham Kulkarni <shubham.kulkarni@espressif.com>

Merges https://github.com/espressif/esp-idf/pull/6044

components/esp_http_client/esp_http_client.c

@@ -569,9 +569,11 @@ esp_http_client_handle_t esp_http_client_init(const esp_http_client_config_t *co
         goto error;
     }
 
+    const char *user_agent = config->user_agent == NULL ? DEFAULT_HTTP_USER_AGENT : config->user_agent;
+
     if (config->host != NULL && config->path != NULL) {
         _success = (
-            (esp_http_client_set_header(client, "User-Agent", DEFAULT_HTTP_USER_AGENT) == ESP_OK) &&
+            (esp_http_client_set_header(client, "User-Agent", user_agent) == ESP_OK) &&
             (esp_http_client_set_header(client, "Host", client->connection_info.host) == ESP_OK)
         );
 
@@ -582,7 +584,7 @@ esp_http_client_handle_t esp_http_client_init(const esp_http_client_config_t *co
     } else if (config->url != NULL) {
         _success = (
                     (esp_http_client_set_url(client, config->url) == ESP_OK) &&
-                    (esp_http_client_set_header(client, "User-Agent", DEFAULT_HTTP_USER_AGENT) == ESP_OK) &&
+                    (esp_http_client_set_header(client, "User-Agent", user_agent) == ESP_OK) &&
                     (esp_http_client_set_header(client, "Host", client->connection_info.host) == ESP_OK)
                 );
 

components/esp_http_client/include/esp_http_client.h

@@ -110,6 +110,7 @@ typedef struct {
     const char                  *cert_pem;           /*!< SSL server certification, PEM format as string, if the client requires to verify server */
     const char                  *client_cert_pem;    /*!< SSL client certification, PEM format as string, if the server requires to verify client */
     const char                  *client_key_pem;     /*!< SSL client key, PEM format as string, if the server requires to verify client */
+    const char                  *user_agent;         /*!< The User Agent string to send with HTTP requests */
     esp_http_client_method_t    method;                   /*!< HTTP Method */
     int                         timeout_ms;               /*!< Network timeout in milliseconds */
     bool                        disable_auto_redirect;    /*!< Disable HTTP automatic redirects */