Ignore host header in proxied request regardless it's casing (#79)

Resolves #77

Author: joelholzerxovis

src/main/java/io/vertx/httpproxy/impl/ProxiedRequest.java

@@ -169,7 +169,7 @@ void sendRequest(Handler<AsyncResult<ProxyResponse>> responseHandler) {
     for (Map.Entry<String, String> header : headers) {
       String name = header.getKey();
       String value = header.getValue();
-      if (!HOP_BY_HOP_HEADERS.contains(name) && !name.equals("host")) {
+      if (!HOP_BY_HOP_HEADERS.contains(name) && !name.equalsIgnoreCase("host")) {
         request.headers().add(name, value);
       }
     }

src/test/java/io/vertx/httpproxy/ProxyRequestTest.java

@@ -448,6 +448,7 @@ public Future<Void> handleProxyResponse(ProxyContext context) {
   @Test
   public void testUpdateRequestHeaders(TestContext ctx) throws Exception {
     SocketAddress backend = startHttpBackend(ctx, 8081, req -> {
+      ctx.assertNotEquals("example.org", req.getHeader("Host"));
       ctx.assertNull(req.getHeader("header"));
       ctx.assertEquals("proxy_header_value", req.getHeader("proxy_header"));
       req.response().putHeader("header", "header_value").end();
@@ -456,6 +457,7 @@ public void testUpdateRequestHeaders(TestContext ctx) throws Exception {
     startHttpServer(ctx, serverOptions, req -> {
       ProxyRequest proxyReq = ProxyRequest.reverseProxy(req);
       MultiMap clientHeaders = proxyReq.headers();
+      clientHeaders.add("Host", "example.org");
       clientHeaders.add("proxy_header", "proxy_header_value");
       ctx.assertEquals("header_value", clientHeaders.get("header"));
       clientHeaders.remove("header");