so we can reuse it in other places like got-fetch-http later. ok op@ stsp@

tls_write() may return TLS_WANT_READ. In that case, we're stuck trying to read while we have the request still in the buffer. So, we have to retry bufio_write() regardless of the POLLIN/POLLOUT state. We'd need this only in the TLS case, but in practice it doesn't harm for the plaintext case too. In fact, we're either waiting to flush the request or we're only reading the server reply. ok stsp

ok op@

ok op@

ok op@

With HTTPS we only need to be able to read /etc/ssl/cert.pem. With plaintext HTTP no filesystem access is needed at all.

We can keep accepting git+ssh for backwards compatibility with existing configs.

just for robustness; neither git nor got-fetch-http are expected to use other methods except for GET and POST.