URL with encoded ":" or "%" cannot be redirected

Hi,
a URL like the following cannot be redirected to the target uri:
http:localhost:8080/mywebapp/myServletPath/%3Asda%25a

The reason is that the ProxyServlet uses servletRequest.getPathInfo() to create the rewriteURL and getPathInfo() returns the decoded path:
/:sda%a

This decoded path is used to create the redirect URL, which leads to an invalid URL in this case. We get an exception like this:

org.apache.http.ProtocolException: Invalid request URI: http:localhost:8080/mywebapp/myServletPath/:sda%a
org.apache.http.impl.client.RequestWrapper.<init>(RequestWrapper.java:83)
org.apache.http.impl.client.EntityEnclosingRequestWrapper.<init>(EntityEnclosingRequestWrapper.java:64)
org.apache.http.impl.client.DefaultRequestDirector.wrapRequest(DefaultRequestDirector.java:328)
org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:379)
org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:863)
org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:115)
org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:57)
org.mitre.dsmiley.httpproxy.ProxyServlet.service(ProxyServlet.java:245)

Suggestion: Use servletRequest.getRequestURI() instead of servletRequest.getPathInfo() to create the rewriteURL, because servletRequest.getRequestURI() returns the URI not decoded (see also http://stackoverflow.com/questions/966077/java-reading-undecoded-url-from-servlet).

Start in ProxyServlet.java around line 245 and compare how getPathInfo() and getRequestURI() are used to build the rewrite URL. Reproduce the encoded-colon and percent URL from the issue, then verify that the redirected request remains a valid URI without the reported ProtocolException.