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https://issues.apache.org/jira/browse/HTTPCLIENT-1995?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17152872#comment-17152872
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Michael Osipov commented on HTTPCLIENT-1995:
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[~mark.mielke], how would you hange this if your code does not comply to a
specific RFC, you fix this and break people's stuff relying on faulty behavior?
The Tomcat team does the same, getting stricter and stricter, even if it does
break stuff.
As there so much discussion about the wording of RFC 3986 it is an indicator
that the language chosen is either to vague or to abstract. Also consider that
many aren't native English speakers so this might lead to interpretation errors
as well. It is up to the authors to take care of it.
> Percent-encoded ampersand in URI path not preserved
> ---------------------------------------------------
>
> Key: HTTPCLIENT-1995
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1995
> Project: HttpComponents HttpClient
> Issue Type: Bug
> Components: HttpClient (classic)
> Affects Versions: 4.5.8, 4.5.9
> Environment: Linux Mint 19, OpenJDK 8
> Reporter: none_
> Priority: Major
>
> Starting with HttpClient 4.5.8, percent-encoded ampersand characters in URI
> path segments are not preserved any longer but written in decoded form to
> wire due to path normalization performed by URIUtils.rewriteURI(URI,
> HttpHost).
>
> According to RFC 3986 (page 11+), the ampersand character is a delimiter and
> thus needs to be percent-encoded when not used for this purpose. Path
> normalization, as performed by HttpClient v4.5.8+, creates a new URI that is
> not equivalent to the original URI and thus leads to misinterpretation on
> server/receiver side.
> ??URIs that differ in the replacement of a reserved character with its??
> ??corresponding percent-encoded octet are not equivalent. Percent-??
> ??encoding a reserved character, or decoding a percent-encoded octet??
> ??that corresponds to a reserved character, will change how the URI is??
> ??interpreted by most applications??.
>
> A very simple test case is as follows:
> {code:java}
> @Test
> public void testAmpersand() throws Throwable
> {
> final URI uri = new
> URI("http://example.org/some/path%26with%20percent/encoded/segments";);
> final URI uri2 = URIUtils.rewriteURI(uri, null);
>
> Assert.assertEquals(uri, uri2);
> }
> {code}
>
>
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