:sig
void Request::ob_start()

:params
return value : none

:see
0_Request
ob_start
ob_get_close

:content
Starts a new output buffer for the request and makes it the active `context.ob`. Most unit code should prefer the higher-level output-buffer helpers (`ob_start()`, `ob_get()`, `ob_get_close()`, `ob_close()`) rather than calling the method directly.


:example
context.ob_start();
print("fragment");
String captured = ob_get_close();
print("captured: ", captured, "\n");