ElesticSearch REST HTTP request through redirected URL

Elastic Stack Elasticsearch
1

Hello,
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 = "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 {
		// parse URL
		System.out.println("URL = " + 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("protocol = " + protocol);
		System.out.println("host = " + host);
		System.out.println("port = " + port);
		System.out.println("path = " + 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("getResponse = " + 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 = {"_index":"demoindex02","_type":"_doc","_id":"Zw6AXnEB8ovVkXyeZ9wF","_version":1,"_seq_no":16,"_primary_term":1,"found":true,"_source":{"id":"1","firstName":"Jason","lastName":"GIBBS","title":"Mister","company":"Mister","phones":["(413)442-5250","(413)442-5252","(413)454-5663"]}}

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 :

image

1. change only URL

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

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(index, id);

The issue is : 404 Not Found

URL = http://192.168.75.197:8060/v1/es/
protocol = http
host = 192.168.75.197
port = 8060
path = /v1/es/
Exception in thread "main" 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]
<html>
<head><title>404 Not Found</title></head>
<body>
<center><h1>404 Not Found</h1></center>
<hr><center>nginx/1.16.1</center>
</body>
</html>
];
	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]
<html>
<head><title>404 Not Found</title></head>
<body>
<center><h1>404 Not Found</h1></center>
<hr><center>nginx/1.16.1</center>
</body>
</html>

	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 = "http://192.168.75.197:8060/v1/es/";
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 "main" 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 = "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);

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 = "http://192.168.75.197:8060/v1/es/";
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

2

Have a look at RestHighLevelClient - Accessing an elastic http endpoint behind reverse proxy

1 Like
3

Thank you , it works fine now.

4

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