【vertx-http-proxy】新增部分内容的翻译

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vertx-china.github.io/docs/translation/vertx-http-proxy/java/index.adoc

Lines 58 to 103 in 49e6873

	=== Origin server routing
	You can create a proxy that forwards all the traffic to a single server like seen before
	You can set an origin selector to route the traffic to a given server
	[source,java]
	----
	proxy.originSelector(request -> Future.succeededFuture(resolveOriginAddress(request)));
	----
	You can set a function to create the client request to the origin server for ultimate flexibility
	[source,java]
	----
	proxy.originRequestProvider((request, client) -> client.request(resolveOriginOptions(request)));
	----
	=== Headers forwarding
	End-to-end headers are forwarded by the proxy, hop-by-hop headers are ignored.
	==== Request authority
	As a transparent proxy, the request authority ({@code Host} header for HTTP/1.1, {@code :authority} pseudo header
	for HTTP/2) is preserved.
	You can override the request authority
	[source,java]
	----
	proxy.addInterceptor(new ProxyInterceptor() {
	@Override
	public Future<ProxyResponse> handleProxyRequest(ProxyContext context) {
	ProxyRequest proxyRequest = context.request();
	proxyRequest.setAuthority("example.com:80");
	return ProxyInterceptor.super.handleProxyRequest(context);
	}
	});
	----
	When the request authority is overridden, the {@code x-forwarded-host} header is set on the request to the origin server
	with the original authority value.
	WARNING: changing the request authority can have undesirable side effects and can affect the proxied web server that might
	rely on the original request authority to handle cookies, URL redirects and such.

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