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Java 通过重定向URL搜索REST HTTP请求

java rest redirect

Java 通过重定向URL搜索REST HTTP请求,java,rest,elasticsearch,redirect,Java,Rest,elasticsearch,Redirect,我请求社区帮助是因为我在请求带有特殊重定向URL的ElasticSearch数据库时遇到了一些问题 你能帮个忙吗 多谢各位 首先，让我们从一个好的案例开始 假设我有一个标准的ElasticSearch URL： 使用ElasticSearch文档： 我可以使用以下Java代码请求它： package com.acme.elasticsearch； 导入java.net.URL； 导入org.apache.http.HttpHost； 导入org.apache.http.auth.AuthScop

我请求社区帮助是因为我在请求带有特殊重定向URL的ElasticSearch数据库时遇到了一些问题

你能帮个忙吗

多谢各位

首先，让我们从一个好的案例开始

假设我有一个标准的ElasticSearch URL：

使用ElasticSearch文档：

我可以使用以下Java代码请求它：

package com.acme.elasticsearch；
导入java.net.URL；
导入org.apache.http.HttpHost；
导入org.apache.http.auth.AuthScope；
导入org.apache.http.auth.UsernamePasswordCredentials；
导入org.apache.http.client.CredentialsProvider；
导入org.apache.http.impl.client.BasicCredentialsProvider；
导入org.apache.http.impl.nio.client.httpacyncclientbuilder；
导入org.elasticsearch.action.get.GetRequest；
导入org.elasticsearch.action.get.GetResponse；
导入org.elasticsearch.client.RequestOptions；
导入org.elasticsearch.client.RestClient；
导入org.elasticsearch.client.RestClientBuilder；
导入org.elasticsearch.client.RestClientBuilder.HttpClientConfigCallback；
导入org.elasticsearch.client.RestHighLevelClient；
公共类TestRedirect{
私有静态最终字符串rawURL=”http://192.168.75.197:9200";
私有静态最终字符串索引=“demoindex02”；
私有静态最终字符串id=“Zw6AXnEB8ovVkXyeZ9wF”；
公共静态void main（字符串[]args）引发异常{
//解析URL
System.out.println（“URL=“+rawURL”）；
URL parsedHttpUrl=新URL（rawURL）；
String protocol=parsedHttpUrl.getProtocol（）；
String host=parsedHttpUrl.getHost（）；
int port=parsedHttpUrl.getPort（）；
String path=parsedHttpUrl.getPath（）；
System.out.println（“协议=”+协议）；
System.out.println（“host=“+host”）；
System.out.println（“端口=”+端口）；
System.out.println（“path=“+path”）；
//实例化HTTP凭据
最终凭证提供程序凭证提供程序=新的基本凭证提供程序（）；
credentialsProvider.setCredentials（AuthScope.ANY，
新用户名密码凭据（Credential.user，Credential.password））；
//实例化REST高级客户机
RestClientBuilder RestClientBuilder=RestClient.builder（新的HttpHost（主机、端口、协议））；
restClientBuilder.setHttpClientConfigCallback（新的HttpClientConfigCallback（）{
@凌驾
公共HttpAsyncClientBuilder自定义HttpClient（HttpAsyncClientBuilder httpClientBuilder）{
返回httpClientBuilder.setDefaultCredentialsProvider（credentialsProvider）；
}
});
RestHighLevelClient RestHighLevelClient=新的RestHighLevelClient（restClientBuilder）；
//简单获取请求
GetRequest GetRequest=新的GetRequest（索引，id）；
GetResponse GetResponse=restHighLevelClient.get（getRequest，RequestOptions.DEFAULT）；
System.out.println（“getResponse=“+getResponse”）；
}
}
我可以在控制台中看到一个很好的结果：

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"]}}
现在问题来了：ElasticSearchURL被重定向（例如，在Apache、Nginx或F5之前…）

URL变为：

此新URL有效：

1。仅更改URL

我使用新的URL修改java代码（客户端和请求保持不变）：

private静态最终字符串rawURL=”http://192.168.75.197:8060/v1/es/";
RestClientBuilder RestClientBuilder=RestClient.builder（新的HttpHost（主机、端口、协议））；
GetRequest GetRequest=新的GetRequest（索引，id）；
问题是：找不到404

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
问题是：未知主机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。更改URL、客户端和请求

我使用新的URL修改java代码，将路径添加到客户端和请求：

private静态最终字符串rawURL=”http://192.168.75.197:8060/v1/es/";
RestClientBuilder RestClientBuilder=RestClient.builder（新的HttpHost（主机+路径、端口、协议））；

GetRequest GetRequest=新的GetRequest（路径+索引，id）最后，答案如下：

所以我修改了我的代码：


//实例化REST高级客户端
RestClientBuilder RestClientBuilder=RestClient.builder（新的HttpHost（主机、端口、协议））；
restClientBuilder.setHttpClientConfigCallback（新的HttpClientConfigCallback（）{
@凌驾
公共HttpAsyncClientBuilder自定义HttpClient（HttpAsyncClientBuilder httpClientBuilder）{
返回httpClientBuilder.setDefaultCredentialsProvider（credentialsProvider）；
}
});
setPathPrefix（路径）；
RestHighLevelClient RestHighLevelClient=新的RestHighLevelClient（restClientBuilder）；