The t_httpc_resp_open_cb definition specifies the format of the callback function that is called when a response is received.
The user implementation (based on the request method) can decide whether a resource needs to be allocated. If it tries to do this and the resource is not currently available (for example, because there is no free file handle), it can signal that a later retry is needed. This function can be called to any kind of method that has a content greater than zero.
|http_req_hdl||The handle of the current request returned by t_httpc_req_open_cb().||uint16_t|
|p_new_hdl||Where to write the new handle. This handle is used by the resp_write() and resp_close() calls.||t_httpc_user_hdl *|
|HTTPC_RETRY||The client must retry later.|