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https://issues.apache.org/jira/browse/HTTPCLIENT-1795?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16095407#comment-16095407
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Andreas Wundsam commented on HTTPCLIENT-1795:
---------------------------------------------
Hi Mike,
thanks for looking into this!
{quote}
The problem appears to be with InetAddress.getAllByName and not with the
HttpGet.
Is this correct?
{quote}
I think the issue isn't with {{InetAddress.getAllByName}} as much;
InetAddress.getAllByName takes an IPv6 literal, which doesn't require the '%'
to be quoted.
The issue is with the URL decoding -- when using a IPv6 literal with a zone ID
as the hostname _in an URL_, the RFC states that the "%" sign should be URL
encoded.
So IMHO, the best place to address the problem would be at the point where
http-client goes from a URL to a decoded hostname. When decoding the hostname
part from the URL {{%25}} would also have to be decoded as {{%}}.
Java's URI.getHost() unfortunately does not specify whether the host literal is
decoded; and looking at the code it at least in Java9 does not seem to decode
it.
Btw; an equivalent bug was reported for the JDK with HttpURLConnection:
https://bugs.openjdk.java.net/browse/JDK-8027308; that bug was closed, but it
looks like the fix in Java9 only fixes part of the reported issue.
Let me know if this helps?
> Http Client does not support RFC-compliant quoted IPv6 Link-Local host
> literals
> -------------------------------------------------------------------------------
>
> Key: HTTPCLIENT-1795
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1795
> Project: HttpComponents HttpClient
> Issue Type: Bug
> Components: HttpClient (async)
> Affects Versions: 4.5.2
> Reporter: Andreas Wundsam
> Labels: stuck, volunteers-wanted
> Fix For: Stuck
>
>
> [RFC 6874|https://tools.ietf.org/html/rfc6874] states that, when constructing
> a URL with an LLv6 literal, the {{%}} sign that prefixes the ZoneID must be
> quoted as {{%25}}. E.g., the LLv6 address
> {{fe80::221:b7ff:fe8a:57d5%en4}} should be specified as
> {{scheme://[fe80::221:b7ff:fe8a:57d5%25en4]/...}} in a URL.
> httpclient does not seem to support quoted host literals:
> Example:
> {code}
> Request.Get("http://[fe80::221:b7ff:fe8a:57d5%25en4]/";)
> .connectTimeout(1000)
> .socketTimeout(1000)
> .execute().returnContent().asString();
> {code}
> results in
> {noformat}
> java.net.UnknownHostException: no such interface 25en4
> at java.net.Inet6Address.initstr(Inet6Address.java:487)
> at java.net.Inet6Address.<init>(Inet6Address.java:408)
> at java.net.InetAddress.getAllByName(InetAddress.java:1181)
> at java.net.InetAddress.getAllByName(InetAddress.java:1126)
> at
> org.apache.http.impl.conn.SystemDefaultDnsResolver.resolve(SystemDefaultDnsResolver.java:45)
> at
> org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:111)
> at
> org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:353)
> at
> org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:380)
> at
> org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:236)
> at
> org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:184)
> at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:88)
> at
> org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)
> at
> org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:184)
> at
> org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
> at
> org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:55)
> at
> org.apache.http.client.fluent.Request.internalExecute(Request.java:173)
> at org.apache.http.client.fluent.Request.execute(Request.java:177)
> at Test.name(Test.java:12)
> [...]
> {noformat}
> It appears that httpclient directly passes the host literal
> {{[fe80::221:b7ff:fe8a:57d5%25en4]}} to the Java standard method
> {{InetAddress.getAllByName(host)}}, which does not support the URL quoting
> that RFC 6874 prescribes.
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