Forwarded header is not parsed as expected

[ejba]

Describe the bug

According to RFC7239, the Forwarded header can have a comma-separated list of values. It is used to indicate the string of proxies (including the client that initiated the request).

The ForwardedParser class splits this header by comma and later considers only the first element. This element will be the one that will determine each property of the request (protocol, host, etc). This is not the expected behavior as it will discard the remaining information in the header, as you will see in the next sections.

Expected behavior

When a client does a HTTP request with the following header, Forwarded: by=proxy;for=backend:4444,for=backend2:5555;host=somehost;proto=https, the quarkus server must consider host and proto properties defined by the header.

Actual behavior

The properties host and proto are not considered, and eventually discarded.

How to Reproduce?

    @Test
    public void testForwardedForWithSequenceOfProxies() {
        assertThat(RestAssured.get("/forward").asString()).startsWith("http|");

        RestAssured.given()
                .header("Forwarded", "by=proxy;for=backend:4444,for=backend2:5555;host=somehost;proto=https")
                .get("/forward")
                .then()
                .body(Matchers.equalTo("https|somehost|backend:4444"));
    }

Output of uname -a or ver

Darwin dibss-MacBook-Pro.local 21.4.0 Darwin Kernel Version 21.4.0: Fri Mar 18 00:45:05 PDT 2022; root:xnu-8020.101.4~15/RELEASE_X86_64 x86_64

Output of java -version

openjdk version "11.0.15" 2022-04-19 OpenJDK Runtime Environment Temurin-11.0.15+10 (build 11.0.15+10) OpenJDK 64-Bit Server VM Temurin-11.0.15+10 (build 11.0.15+10, mixed mode)

GraalVM version (if different from Java)

No response

Quarkus version or git rev

No response

Build tool (ie. output of mvnw --version or gradlew --version)

Apache Maven 3.8.4 (9b656c72d54e5bacbed989b64718c159fe39b537)

Additional information

No response

[ejba]

/cc @sberyozkin @luneo7