Added JsonPage and finished implementation of digest auth page

test/zutil/net/http/HttpTestUtil.java

@@ -0,0 +1,30 @@
+package zutil.net.http;
+
+import zutil.io.StringOutputStream;
+import zutil.net.http.page.HttpDigestAuthPageTest;
+
+import java.io.IOException;
+import java.util.HashMap;
+
+public class HttpTestUtil {
+    public static HashMap<String,Object> session = new HashMap();
+
+    /**
+     * Make a simple http request on the given page object
+     */
+    public static HttpHeader makeRequest(HttpPage page) throws IOException {
+        return makeRequest(page, new HttpHeader());
+    }
+    /**
+     * Make a simple http request on the given page object
+     */
+    public static HttpHeader makeRequest(HttpPage page, HttpHeader headers) throws IOException {
+        StringOutputStream buff = new StringOutputStream();
+        HttpPrintStream out = new HttpPrintStream(buff);
+        page.respond(
+                out, headers, session, new HashMap(), new HashMap());
+        out.flush();
+        HttpHeaderParser parser = new HttpHeaderParser(buff.toString());
+        return parser.read();
+    }
+}