void BearHttpsRequest_add_header_fmt(BearHttpsRequest *self, const char *key, const char *format, ...);Adds a header to the HTTP request using printf-style formatting for the value. This is useful when you need to construct header values dynamically.
self: Pointer to theBearHttpsRequestobjectkey: The header key/name (e.g., "Content-Length", "Authorization")format: Printf-style format string for the header value...: Variable arguments matching the format string
This function does not return a value.