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https://issues.apache.org/jira/browse/HTTPCORE-744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17716729#comment-17716729
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Michael Osipov commented on HTTPCORE-744:
-----------------------------------------
Here it is:
URIs include components and subcomponents that are delimited by
characters in the "reserved" set. These characters are called
"reserved" because they may (or may not) be defined as delimiters by
the generic syntax, by each scheme-specific syntax, or by the
implementation-specific syntax of a URI's dereferencing algorithm.
If data for a URI component would conflict with a reserved
character's purpose as a delimiter, then the conflicting data must be
percent-encoded before the URI is formed.
> HttpCore 5.2.1 does not correctly handle semi-colon (;) and equal sign (=)
> characters in URI set as Location header.
> --------------------------------------------------------------------------------------------------------------------
>
> Key: HTTPCORE-744
> URL: https://issues.apache.org/jira/browse/HTTPCORE-744
> Project: HttpComponents HttpCore
> Issue Type: Bug
> Components: HttpCore
> Affects Versions: 5.2.1
> Environment: httpclient5, version 5.1.2
> httpcore5, version 5.1.2
> javax.servlet-api, version 3.1.0
> Reporter: Krasimir Malchev
> Priority: Major
> Attachments: Simulation.zip
>
>
> If an http response has an URI in the Location header, which contains special
> symbols - semi-colon ( ; ) and equal sign (=), the URI parser of the
> underlaying URI builder encodes these symbols to %3B and %3D. Then the
> redirect will be performed using the encoded URI.
> {+}Real Use Case where the issue is detected with httpcomonents updated from
> version 4 to 5{+}: SAML Artifact binding in an IDP initiated SSO
> communication.
> A simple simulation program is attached to demonstrate the problem.
> +Test Case:+ There is a servlet and a client application.
> 1. The client application sends an HTTP GET request to the servlet with URI
> "http://localhost:8080/test/welcome";
> 2. The servlet receives the request and sends a redirect response with a
> relative location - /test/httpclient4/welcomeHttpClient
> 2.1. Before sending the response the redirect URL is encoded (by calling the
> method HttpServletResponse.encodeRedirectURL(String location)).
> 2.2.The latter method adds jsessionid at the end of the new location in
> accordance to the [Java Servlet Specification, section 7.1.3 - URL
> Rewriting|https://javaee.github.io/servlet-spec/downloads/servlet-3.1/Final/servlet-3_1-final.pdf].
> As a result, the redirect location becomes similar to
> _/test/httpclient/welcomeHttpClient;jsessionid=FD86C2C971F595C8459028D585BCF26F_
> 3. When the response is received the httpclient parses the new location and
> encodes it to:
> http://localhost:8080/test/httpclient/welcomeHttpClient%3Bjsessionid%3DFD86C2C971F595C8459028D585BCF26F
> This is an issue, because the latter URL is redirected at the end with
> {_}{*}%3B{*}jsessionid{*}%3D{*}FD86C2C971F595C8459028D585BCF26{_}F (i.e. no
> such endpoint exists). Also _jsessionid_ is not recognized as a path
> parameter.
> The expected redirect URL is without encoded semi-colon and equal sign :
> http://localhost:8080/test/httpclient/welcomeHttpClient;jsessionid=FD86C2C971F595C8459028D585BCF26F
> +Remarks:+
> * If the servlet redirects a full URI instead of a relative URI (for
> example,
> http://localhost:8080/test/httpclient/welcomeHttpClient;jsessionid=FD86C2C971F595C8459028D585BCF26F,
> then the httpclient response is properly parsed and the redirect URL has no
> encoded semi-colon and equal sign characters.
> * If http client 4.5.5 and httpcore 4.4.9 are used, then the described issue
> is not present.
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