Github user vanzin commented on a diff in the pull request: https://github.com/apache/spark/pull/13950#discussion_r73757842 --- Diff: core/src/main/scala/org/apache/spark/ui/JettyUtils.scala --- @@ -186,6 +188,66 @@ private[spark] object JettyUtils extends Logging { contextHandler } + /** Create a handler for proxying request to Workers and Application Drivers */ + def createProxyHandler( + prefix: String, + target: String): ServletContextHandler = { + val servlet = new ProxyServlet { + override def rewriteTarget(request: HttpServletRequest): String = { + val path = request.getRequestURI(); + if (!path.startsWith(prefix)) return null + + val uri = new StringBuilder(target) + if (target.endsWith("/")) uri.setLength(uri.length() - 1) + val rest = path.substring(prefix.length()) + if (!rest.isEmpty()) { + if (!rest.startsWith("/")) { + uri.append("/") + } + uri.append(rest) + } + + val query = request.getQueryString() + if (query != null) { + // Is there at least one path segment ? + val separator = "://" + if (uri.indexOf("/", uri.indexOf(separator) + separator.length()) < 0) { + uri.append("/") + } + uri.append("?").append(query) + } + val rewrittenURI = URI.create(uri.toString()).normalize() + + if (!validateDestination(rewrittenURI.getHost(), rewrittenURI.getPort())) { + return null + } + + rewrittenURI.toString(); + } + override def filterServerResponseHeader( --- End diff -- nit: add empty line between methods
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