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https://issues.apache.org/jira/browse/HTTPCLIENT-1960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16741294#comment-16741294
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Raymond Cuenen commented on HTTPCLIENT-1960:
--------------------------------------------

Ah ok.

I cannot find anything other then dot-removal for path normalization in RFC 
3986, however the javadoc of the {{java.net.URI}} normalize method says:
{noformat}
A normal path string has no empty segments, no segments equal to ".", and no 
segments equal to ".."
{noformat}
In that case the normalization of the {{URIBuilder}} is incomplete, because 
only the first empty segments are removed; {{"//etc//motd"}} becomes 
{{"/etc//motd"}}, while with {{URI.normalize()}}; {{"//etc//motd"}} becomes 
{{"/etc/motd"}}.

Apart from that, I would not expect an URI builder / parser to perform implicit 
normalization since it is optional. Your suggestion to make normalization 
explicit would be an improvement.

> URIBuilder does not handle absolute path values
> -----------------------------------------------
>
>                 Key: HTTPCLIENT-1960
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1960
>             Project: HttpComponents HttpClient
>          Issue Type: Bug
>          Components: HttpClient (async), HttpClient (classic)
>    Affects Versions: 4.5.5
>            Reporter: Raymond Cuenen
>            Priority: Major
>
> If original path startsWith '/' it is removed by normalizePath; in that case 
> it should be added again URI-encoded. For example: A path value of 
> '/etc/motd' becomes:
> {code:java}
> ftp://[email protected]/etc/motd{code}
> while it should be:
> {code:java}
> ftp://[email protected]/%2Fetc/motd{code}
> Only when the path value is 'etc/motd' is should become 
> "ftp://[email protected]/etc/motd";
>   
> Fix for this issue in URIBuilder.java:
> {noformat}
> private String buildString() {
> ...
>     if (this.encodedPath != null) {
>         sb.append(normalizePath(this.encodedPath, sb.length() == 0));
>     } else if (this.path != null) {
>         String encodedPath = encodePath(normalizePath(this.path, sb.length() 
> == 0));
>         // Start fix for paths starting with '/'
>         // If original path startsWith '/' it is removed by normalizePath; in 
> that case it should be added again URI-encoded.
>         if (this.path.startsWith("/")) {
>             encodedPath = "/%2F" + encodedPath.substring(1);
>         }
>         // End fix
>         sb.append(encodedPath);
>     }
> ...
> }{noformat}



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