Function libnghttp2_sys::nghttp2_session_callbacks_set_on_begin_headers_callback

pub unsafe extern "C" fn nghttp2_session_callbacks_set_on_begin_headers_callback(
    cbs: *mut nghttp2_session_callbacks, 
    on_begin_headers_callback: nghttp2_on_begin_headers_callback
)

@function

Sets callback function invoked when the reception of header block in HEADERS or PUSH_PROMISE is started.