2020年4月10日 18:17:09go评论63阅读模式

英文:

ElesticSearch REST HTTP request through redirected URL

问题

以下是翻译好的部分：

首先，让我们从一个案例开始。

假设我有这个标准的 ElasticSearch URL：http://192.168.75.197:9200

根据 ElasticSearch 文档：https://www.elastic.co/guide/en/elasticsearch/client/java-rest/current/_changing_the_client_8217_s_initialization_code.html

我可以使用以下 Java 代码请求它：

package com.acme.elasticsearch;

import java.net.URL;
import org.apache.http.HttpHost;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.nio.client.HttpAsyncClientBuilder;
import org.elasticsearch.action.get.GetRequest;
import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.elasticsearch.client.RestClientBuilder.HttpClientConfigCallback;
import org.elasticsearch.client.RestHighLevelClient;

public class TestRedirect {
    private static final String rawURL = "http://192.168.75.197:9200";
    private static final String index = "demoindex02";
    private static final String id = "Zw6AXnEB8ovVkXyeZ9wF";

    public static void main(String[] args) throws Exception {
        // ...
    }
}

现在我可以在控制台中看到一个好的结果：

接下来是问题：ElasticSearch 的 URL 被重定向了（例如，在 Apache、Nginx 或 F5 的前面）

新的 URL 变成：http://192.168.75.197:8060/v1/es/

这个新的 URL 是有效的：

仅更改 URL

我只调整了我的 Java 代码中的新 URL（客户端和请求保持不变）：

private static final String rawURL = "http://192.168.75.197:8060/v1/es/";

问题是：404 Not Found

更改 URL 和客户端

我只调整了我的 Java 代码中的新 URL 并将路径添加到客户端（请求保持不变）：

private static final String rawURL = "http://192.168.75.197:8060/v1/es/";
RestClientBuilder restClientBuilder = RestClient.builder(new HttpHost(host + path, port, protocol));

问题是：Unknown host 192.168.75.197/v1/es/

更改 URL、客户端和请求

我只调整了我的 Java 代码中的新 URL，并在客户端和请求中添加了路径：

private static final String rawURL = "http://192.168.75.197:8060/v1/es/";
RestClientBuilder restClientBuilder = RestClient.builder(new HttpHost(host + path, port, protocol));
GetRequest getRequest = new GetRequest(path + index, id);

问题与上述第2点完全相同：Unknown host 192.168.75.197/v1/es/

仅更改 URL 和请求

我只调整了我的 Java 代码中的新 URL，并在请求中添加了路径（客户端保持不变）：

private static final String rawURL = "http://192.168.75.197:8060/v1/es/";
RestClientBuilder restClientBuilder = RestClient.builder(new HttpHost(host, port, protocol));
GetRequest getRequest = new GetRequest(path + index, id);

问题与上述第1点完全相同：404 Not Found

英文:

I am asking community help because I have some trouble requesting an ElasticSearch database with a special redirected URL.

Can you please give an hand on this ?

Thank you very much.

First, let's start with a fine case.

Let's assume that I have this standard ElasticSearch URL : http://192.168.75.197:9200

With ElasticSearch documentation : https://www.elastic.co/guide/en/elasticsearch/client/java-rest/current/_changing_the_client_8217_s_initialization_code.html

I can request it with this Java code :

package com.acme.elasticsearch;

import java.net.URL;

import org.apache.http.HttpHost;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.nio.client.HttpAsyncClientBuilder;
import org.elasticsearch.action.get.GetRequest;
import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.elasticsearch.client.RestClientBuilder.HttpClientConfigCallback;
import org.elasticsearch.client.RestHighLevelClient;

public class TestRedirect {
	private static final String rawURL = &quot;http://192.168.75.197:9200&quot;;
	private static final String index = &quot;demoindex02&quot;;
	private static final String id = &quot;Zw6AXnEB8ovVkXyeZ9wF&quot;;

	public static void main(String[] args) throws Exception {
		// parse URL
		System.out.println(&quot;URL = &quot; + rawURL);
		URL parsedHttpUrl = new URL(rawURL);
		String protocol = parsedHttpUrl.getProtocol();
		String host = parsedHttpUrl.getHost();
		int port = parsedHttpUrl.getPort();
		String path = parsedHttpUrl.getPath();
		System.out.println(&quot;protocol = &quot; + protocol);
		System.out.println(&quot;host = &quot; + host);
		System.out.println(&quot;port = &quot; + port);
		System.out.println(&quot;path = &quot; + path);
		// instantiate HTTP credentials
		final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
		credentialsProvider.setCredentials(AuthScope.ANY,
				new UsernamePasswordCredentials(Credential.user, Credential.password));
		// instantiate REST high level client
		RestClientBuilder restClientBuilder = RestClient.builder(new HttpHost(host, port, protocol));
		restClientBuilder.setHttpClientConfigCallback(new HttpClientConfigCallback() {
			@Override
			public HttpAsyncClientBuilder customizeHttpClient(HttpAsyncClientBuilder httpClientBuilder) {
				return httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider);
			}
		});
		RestHighLevelClient restHighLevelClient = new RestHighLevelClient(restClientBuilder);
		// simple get request
		GetRequest getRequest = new GetRequest(index, id);
		GetResponse getResponse = restHighLevelClient.get(getRequest, RequestOptions.DEFAULT);
		System.out.println(&quot;getResponse = &quot; + getResponse);
	}

}

I can see in my console a fine result :

URL = http://192.168.75.197:9200
protocol = http
host = 192.168.75.197
port = 9200
path = 
getResponse = {&quot;_index&quot;:&quot;demoindex02&quot;,&quot;_type&quot;:&quot;_doc&quot;,&quot;_id&quot;:&quot;Zw6AXnEB8ovVkXyeZ9wF&quot;,&quot;_version&quot;:1,&quot;_seq_no&quot;:16,&quot;_primary_term&quot;:1,&quot;found&quot;:true,&quot;_source&quot;:{&quot;id&quot;:&quot;1&quot;,&quot;firstName&quot;:&quot;Jason&quot;,&quot;lastName&quot;:&quot;GIBBS&quot;,&quot;title&quot;:&quot;Mister&quot;,&quot;company&quot;:&quot;Mister&quot;,&quot;phones&quot;:[&quot;(413)442-5250&quot;,&quot;(413)442-5252&quot;,&quot;(413)454-5663&quot;]}}

Now comes the issue : the ElasticSearch URL is redirected (for example, in front of Apache, Nginx or F5 ...)

The URL becomes : http://192.168.75.197:8060/v1/es/

This new URL is valid :

1. change only URL

I adapt my java code with just new URL (client and request remain the same) :

private static final String rawURL = &quot;http://192.168.75.197:8060/v1/es/&quot;;
RestClientBuilder restClientBuilder = RestClient.builder(new HttpHost(host, port, protocol));
GetRequest getRequest = new GetRequest(index, id);

The issue is : 404 Not Found

Exception in thread &quot;main&quot; ERROR StatusLogger Log4j2 could not find a logging implementation. Please add log4j-core to the classpath. Using SimpleLogger to log to the console...
ElasticsearchStatusException[Unable to parse response body]; nested: ResponseException[method [GET], host [http://192.168.75.197:8060], URI [/demoindex02/_doc/Zw6AXnEB8ovVkXyeZ9wF], status line [HTTP/1.1 404 Not Found]
&lt;html&gt;
&lt;head&gt;&lt;title&gt;404 Not Found&lt;/title&gt;&lt;/head&gt;
&lt;body&gt;
&lt;center&gt;&lt;h1&gt;404 Not Found&lt;/h1&gt;&lt;/center&gt;
&lt;hr&gt;&lt;center&gt;nginx/1.16.1&lt;/center&gt;
&lt;/body&gt;
&lt;/html&gt;
];
	at org.elasticsearch.client.RestHighLevelClient.parseResponseException(RestHighLevelClient.java:1686)
	at org.elasticsearch.client.RestHighLevelClient.internalPerformRequest(RestHighLevelClient.java:1443)
	at org.elasticsearch.client.RestHighLevelClient.performRequest(RestHighLevelClient.java:1403)
	at org.elasticsearch.client.RestHighLevelClient.performRequestAndParseEntity(RestHighLevelClient.java:1373)
	at org.elasticsearch.client.RestHighLevelClient.get(RestHighLevelClient.java:699)
	at com.acme.elasticsearch.TestRedirect.main(TestRedirect.java:52)
	Suppressed: java.lang.IllegalStateException: Unsupported Content-Type: text/html
		at org.elasticsearch.client.RestHighLevelClient.parseEntity(RestHighLevelClient.java:1703)
		at org.elasticsearch.client.RestHighLevelClient.parseResponseException(RestHighLevelClient.java:1683)
		... 5 more
Caused by: org.elasticsearch.client.ResponseException: method [GET], host [http://192.168.75.197:8060], URI [/demoindex02/_doc/Zw6AXnEB8ovVkXyeZ9wF], status line [HTTP/1.1 404 Not Found]
&lt;html&gt;
&lt;head&gt;&lt;title&gt;404 Not Found&lt;/title&gt;&lt;/head&gt;
&lt;body&gt;
&lt;center&gt;&lt;h1&gt;404 Not Found&lt;/h1&gt;&lt;/center&gt;
&lt;hr&gt;&lt;center&gt;nginx/1.16.1&lt;/center&gt;
&lt;/body&gt;
&lt;/html&gt;

	at org.elasticsearch.client.RestClient.convertResponse(RestClient.java:260)
	at org.elasticsearch.client.RestClient.performRequest(RestClient.java:238)
	at org.elasticsearch.client.RestClient.performRequest(RestClient.java:212)
	at org.elasticsearch.client.RestHighLevelClient.internalPerformRequest(RestHighLevelClient.java:1433)
	... 4 more

2. change URL & client only

I adapt my java code with just new URL and add path to client (request remains the same) :

private static final String rawURL = &quot;http://192.168.75.197:8060/v1/es/&quot;;
RestClientBuilder restClientBuilder = RestClient.builder(new HttpHost(host + path, port, protocol));
GetRequest getRequest = new GetRequest(index, id);

The issue is : Unknown host 192.168.75.197/v1/es/

URL = http://192.168.75.197:8060/v1/es/
protocol = http
host = 192.168.75.197
port = 8060
path = /v1/es/
Exception in thread &quot;main&quot; java.io.IOException: 192.168.75.197/v1/es/
	at org.elasticsearch.client.RestClient.extractAndWrapCause(RestClient.java:809)
	at org.elasticsearch.client.RestClient.performRequest(RestClient.java:225)
	at org.elasticsearch.client.RestClient.performRequest(RestClient.java:212)
	at org.elasticsearch.client.RestHighLevelClient.internalPerformRequest(RestHighLevelClient.java:1433)
	at org.elasticsearch.client.RestHighLevelClient.performRequest(RestHighLevelClient.java:1403)
	at org.elasticsearch.client.RestHighLevelClient.performRequestAndParseEntity(RestHighLevelClient.java:1373)
	at org.elasticsearch.client.RestHighLevelClient.get(RestHighLevelClient.java:699)
	at com.acme.elasticsearch.TestRedirect.main(TestRedirect.java:52)
Caused by: java.net.UnknownHostException: 192.168.75.197/v1/es/
	at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
	at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:929)
	at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1324)
	at java.net.InetAddress.getAllByName0(InetAddress.java:1277)
	at java.net.InetAddress.getAllByName(InetAddress.java:1193)
	at java.net.InetAddress.getAllByName(InetAddress.java:1127)
	at org.apache.http.impl.conn.SystemDefaultDnsResolver.resolve(SystemDefaultDnsResolver.java:45)
	at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager$InternalAddressResolver.resolveRemoteAddress(PoolingNHttpClientConnectionManager.java:664)
	at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager$InternalAddressResolver.resolveRemoteAddress(PoolingNHttpClientConnectionManager.java:635)
	at org.apache.http.nio.pool.AbstractNIOConnPool.processPendingRequest(AbstractNIOConnPool.java:474)
	at org.apache.http.nio.pool.AbstractNIOConnPool.lease(AbstractNIOConnPool.java:280)
	at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager.requestConnection(PoolingNHttpClientConnectionManager.java:295)
	at org.apache.http.impl.nio.client.AbstractClientExchangeHandler.requestConnection(AbstractClientExchangeHandler.java:377)
	at org.apache.http.impl.nio.client.DefaultClientExchangeHandlerImpl.start(DefaultClientExchangeHandlerImpl.java:129)
	at org.apache.http.impl.nio.client.InternalHttpAsyncClient.execute(InternalHttpAsyncClient.java:141)
	at org.elasticsearch.client.RestClient.performRequest(RestClient.java:221)
	... 6 more

3. change URL, client and request

I adapt my java code with just new URL, add path to both client & request :

private static final String rawURL = &quot;http://192.168.75.197:8060/v1/es/&quot;;
RestClientBuilder restClientBuilder = RestClient.builder(new HttpHost(host + path, port, protocol));
GetRequest getRequest = new GetRequest(path + index, id);

The issue is the exact same as in point #2 above : Unknown host 192.168.75.197/v1/es/

4. change URL & request only

I adapt my java code with just new URL and add path to request (client remains the same) :

private static final String rawURL = &quot;http://192.168.75.197:8060/v1/es/&quot;;
RestClientBuilder restClientBuilder = RestClient.builder(new HttpHost(host, port, protocol));
GetRequest getRequest = new GetRequest(path + index, id);

The issue is the exact same as in point #1 above : 404 Not Found

答案1

得分: 0

最终，答案在这里：[RestHighLevelClient - 访问位于反向代理后面的 Elastic HTTP 终端][1]

因此，我按照以下方式修改了我的代码：

&lt;!-- begin snippet: js hide: false console: true babel: false --&gt;

&lt;!-- language: lang-java --&gt;

// 实例化 REST 高级客户端
RestClientBuilder restClientBuilder = RestClient.builder(new HttpHost(host, port, protocol));
restClientBuilder.setHttpClientConfigCallback(new HttpClientConfigCallback() {
    @Override
    public HttpAsyncClientBuilder customizeHttpClient(HttpAsyncClientBuilder httpClientBuilder) {
        return httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider);
    }
});
restClientBuilder.setPathPrefix(path);
RestHighLevelClient restHighLevelClient = new RestHighLevelClient(restClientBuilder);

&lt;!-- end snippet --&gt;

[1]: https://discuss.elastic.co/t/resthighlevelclient-accessing-an-elastic-http-endpoint-behind-reverse-proxy/117306/2

英文:

Finally, answer is here : RestHighLevelClient - Accessing an elastic http endpoint behind reverse proxy

So I modified my code this way :

		// instantiate REST high level client
		RestClientBuilder restClientBuilder = RestClient.builder(new HttpHost(host, port, protocol));
		restClientBuilder.setHttpClientConfigCallback(new HttpClientConfigCallback() {
			@Override
			public HttpAsyncClientBuilder customizeHttpClient(HttpAsyncClientBuilder httpClientBuilder) {
				return httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider);
			}
		});
		restClientBuilder.setPathPrefix(path);
		RestHighLevelClient restHighLevelClient = new RestHighLevelClient(restClientBuilder);

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ElasticSearch通过重定向的URL进行REST HTTP请求

问题

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