/**
* returns lowercase set of tokens in 'connection' header.
*
* <p>rfc 2616:14.10: proxy must parse connection header and remove any fields with same name as
* connection tokens.
*
* <p>HttpClient will add its own Connection headers to manage persistent connections between
* proxy and server.
*/
private static Set<String> getConnectionTokensFromRequest(HttpServletRequest req) {
HeaderValueParser parser = new BasicHeaderValueParser();
Enumeration<String> headers = req.getHeaders(CONNECTION_HEADER);
Set<String> result = new HashSet<String>();
while (headers.hasMoreElements()) {
final String header = headers.nextElement();
CharArrayBuffer buffer = new CharArrayBuffer(header.length() + 10);
buffer.append(header);
ParserCursor cursor = new ParserCursor(0, buffer.length());
for (HeaderElement element : parser.parseElements(buffer, cursor)) {
result.add(element.getName().toLowerCase());
}
}
return result;
}
@Override
protected void parseChallenge(final CharArrayBuffer buffer, int pos, int len)
throws MalformedChallengeException {
HeaderValueParser parser = BasicHeaderValueParser.DEFAULT;
ParserCursor cursor = new ParserCursor(pos, buffer.length());
HeaderElement[] elements = parser.parseElements(buffer, cursor);
if (elements.length == 0) {
throw new MalformedChallengeException("Authentication challenge is empty");
}
this.params = new HashMap<String, String>(elements.length);
for (HeaderElement element : elements) {
this.params.put(element.getName(), element.getValue());
}
}