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chore: log that HTTP/3 is not used through proxies #1580

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Merged
jlouvel merged 1 commit into from
Nov 1, 2026
Merged

chore: log that HTTP/3 is not used through proxies #1580

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9 changes: 8 additions & 1 deletion org.restlet/src/main/java/org/restlet/engine/netty/NettyClientHelper.java
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Original file line number Diff line number Diff line change
Expand Up @@ -140,7 +140,7 @@
* (HTTP/2 only: negotiated with ALPN over TLS, prior knowledge in cleartext, except through a
* forward proxy where HTTP/1.1 is used), "DYNAMIC" (HTTP/2
* when negotiated with ALPN over TLS, HTTP/1.1 otherwise), "HTTP3" (<b>experimental</b>: HTTP/3
* over QUIC for HTTPS URIs without proxy, HTTP/1.1 otherwise; requires the optional
* over QUIC for HTTPS URIs without HTTP or SOCKS proxy, HTTP/1.1 otherwise; requires the optional
* {@code io.netty:netty-codec-http3} dependency with its native QUIC library, and the {@link
* org.restlet.engine.ssl.DefaultSslContextFactory}).</td>
* </tr>
Expand Down Expand Up @@ -1032,6 +1032,13 @@ public synchronized void start() throws Exception {
if (getTransportMode() == TransportMode.HTTP3) {
Http3Availability.ensureAvailable();
getLogger().warning("HTTP/3 support is experimental");
if ((getHttpsProxyHost() != null) || (getSocksProxyHost() != null)) {
// Proxying QUIC requires CONNECT-UDP (RFC 9298), not supported by Netty yet.
getLogger()
.info(
"HTTP/3 is not used through proxies: the HTTPS requests sent"
+ " through a proxy use HTTP/1.1 over TCP");
}
}
super.start();
group =
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