Configure Jetty to use legacy compliance

This prevents changing header value cases which previously caused S3
signature mismatches.  Fixes #392.
References jetty/jetty.project#7168.

src/main/java/org/gaul/s3proxy/S3Proxy.java

@@ -31,6 +31,8 @@
 import com.google.common.base.Strings;
 import com.google.common.collect.Lists;
 
+import org.eclipse.jetty.http.HttpCompliance;
+import org.eclipse.jetty.server.HttpConfiguration;
 import org.eclipse.jetty.server.HttpConnectionFactory;
 import org.eclipse.jetty.server.Server;
 import org.eclipse.jetty.server.ServerConnector;
@@ -51,12 +53,6 @@ public final class S3Proxy {
     private final boolean listenHTTP;
     private final boolean listenHTTPS;
 
-    static {
-        // Prevent Jetty from rewriting headers:
-        // https://bugs.eclipse.org/bugs/show_bug.cgi?id=414449
-        System.setProperty("org.eclipse.jetty.http.HttpParser.STRICT", "true");
-    }
-
     S3Proxy(Builder builder) {
         checkArgument(builder.endpoint != null ||
                         builder.secureEndpoint != null,
@@ -89,7 +85,8 @@ public final class S3Proxy {
         }
 
         HttpConnectionFactory httpConnectionFactory =
-                new HttpConnectionFactory();
+                new HttpConnectionFactory(
+                        new HttpConfiguration(), HttpCompliance.LEGACY);
         ServerConnector connector;
         if (builder.endpoint != null) {
             connector = new ServerConnector(server, httpConnectionFactory);