5/5/2023 0 Comments Http client c![]() The client will receive the 401 Unauthorized header in its first attempt to connect to the server. If auth_type = HTTP_AUTH_TYPE_NONE, but the username and password fields are present in the configuration, the HTTP client takes 2 perform operations. ![]() For auth_type = HTTP_AUTH_TYPE_BASIC, the HTTP client takes only 1 perform operation to pass the authentication process. Users can provide the username and password in the url or the username and password members of the esp_http_client_config_t configuration. HTTP Authentication ESP HTTP client supports both Basic and Digest Authentication. Returns the content-length from the server and can be succeeded by esp_http_client_get_status_code() for getting the HTTP status of the connection.Įsp_http_client_read(): Read the HTTP streamĮsp_http_client_close(): Close the connectionĮsp_http_client_cleanup(): Release allocated resourcesĬheck out the example function http_perform_as_stream_reader in the application example for implementation details. HTTPS support can be configured via CONFIG_ESP_HTTP_CLIENT_ENABLE_HTTPS (enabled by default).Įsp_http_client_init(): Create a HTTP client handleĮsp_http_client_set_* or esp_http_client_delete_*: Modify the HTTP connection parameters (optional)Įsp_http_client_open(): Open the HTTP connection with write_len parameter (content length that needs to be written to server), set write_len=0 for read-only connectionĮsp_http_client_write(): Write data to server with a maximum length equal to write_len of esp_http_client_open() function no need to call this function for write_len=0Įsp_http_client_fetch_headers(): Read the HTTP Server response headers, after sending the request headers and server data (if any). HTTPS Request ĮSP HTTP client supports SSL connections using mbedTLS, with the url configuration starting with https scheme or transport_type set to HTTP_TRANSPORT_OVER_SSL. Here, once the connection is created, multiple requests ( GET, POST, PUT, etc.) are made before the connection is closed. To allow ESP HTTP client to take full advantage of persistent connections, one should make as many requests as possible using the same handle instance.Ĭheck out the example functions http_rest_with_url and http_rest_with_hostname_path in the application example. If the server does not request to close the connection with the Connection: close header, the connection is not dropped but is instead kept open and used for further requests. ![]() Persistent connection means that the HTTP client can re-use the same connection for several exchanges. Basic HTTP request Ĭheck out the example functions http_rest_with_url and http_rest_with_hostname_path in the application example for implementation details. Simple example that uses ESP HTTP Client to make HTTP/S requests at protocols/esp_http_client. This must be the last function to be called after the completion of operations. All related events will be invoked through the event handler (as specified in esp_http_client_config_t).Įsp_http_client_cleanup(): Closes the connection (if any) and frees up all the memory allocated to the HTTP client instance. This function must be the first to be called default values will be assumed for the configuration values that are not explicitly defined by the user.Įsp_http_client_perform(): Performs all operations of the esp_http_client - opening the connection, exchanging data and closing the connection (as required), while blocking the current task until its completion. a HTTP client handle based on the given esp_http_client_config_t configuration. Esp_http_client_init(): Creates an esp_http_client_handle_t instance i.e.
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