Checks result of the message and sets the throws if it failed.
When it failed and the read_bytes is provided, then these are set to message's response body, thus it can be
used later.
| this |
an SoupSession |
| message |
a Message |
| read_bytes |
optional bytes which had been read from the stream, or null |
| bytes_length |
how many bytes had been read; ignored when |
|
Whether succeeded, aka true, when no error recognized and false otherwise. |