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https://issues.apache.org/jira/browse/HTTPCLIENT-1968?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16765916#comment-16765916
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Cservenak, Tamas commented on HTTPCLIENT-1968:
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Would be good if the fix in HTTPCLIENT-1960 becomes somehow controlled (ie.
from HttpContext?). Currently, we cannot upgrade our http client (used in proxy
for Azure Docker registry) due to their "known issue": they emit redirect
responses with paths having double slashes, and worse, they *expect those to be
there* (as otherwise they claim requested resource is not there).
With pre 4.5.7 HttpClient this worked fine for us with having custom
{{RedirectStrategy}} in place. But since 4.5.7 (or better since HTTPCLIENT-1960
change), where URIUtil is changed to do this, the "ironing out" of double
slashes happens across client and custom redirect strategy does not work either.
See
https://github.com/docker/distribution/issues/1247
> Encoded forward slashes are not preserved when rewriting URI
> ------------------------------------------------------------
>
> Key: HTTPCLIENT-1968
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1968
> Project: HttpComponents HttpClient
> Issue Type: Bug
> Affects Versions: 4.5.7
> Reporter: Jay Modi
> Priority: Major
> Attachments: rewrite_preserve_forward_slash.diff
>
>
> URIs that contain an encoded forward slash (%2F) are no longer preserved when
> the HTTP client executes. I came across this when upgrading from 4.5.2 to
> 4.5.7 and my requests that contained an encoded forward slash suddenly
> started failing. The appears to be due to decoding and re-encoding of the
> path that takes place in the URIUtils#rewriteURI method. I've attached a
> patch that restores the old behavior but if a URI contains two slashes in a
> row in addition to an encoded slash the encoded forward slash will be decoded.
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