solr异常--Expected mime type application/octet-stream but got text/html.

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Exception in thread "main" org.apache.solr.client.solrj.impl.HttpSolrServer$RemoteSolrException:

Expected mime type application/octet-stream but got text/html.<html><head><title>Apache Tomcat/7.0.54 - Error report</title><style></style> </head><body><h1>HTTP Status 404 - /solr/core0/update/extract</h1><HR size="1" noshade="noshade"><p><b>type</b> Status report</p><p><b>message</b> <u>/solr/core0/update/extract</u></p><p><b>description</b> <u>The requested resource is not available.</u></p><HR size="1" noshade="noshade"><h3>Apache Tomcat/7.0.54</h3></body></html>

at org.apache.solr.client.solrj.impl.HttpSolrServer.executeMethod(HttpSolrServer.java:516)
at org.apache.solr.client.solrj.impl.HttpSolrServer.request(HttpSolrServer.java:210)
at org.apache.solr.client.solrj.impl.HttpSolrServer.request(HttpSolrServer.java:206)
at solrj.CreateIndexFromPDF.indexFilesSolrCell(CreateIndexFromPDF.java:54)

at solrj.CreateIndexFromPDF.main(CreateIndexFromPDF.java:21)

部分代码：

       String urlString = "http://localhost:8080/solr/core0";
        SolrServer solr = new HttpSolrServer(urlString);
        ContentStreamUpdateRequest up = new ContentStreamUpdateRequest("/update/extract");

是因为我用的： core0 （这个在当前的solr目录下是不存在的）,已经被删除了。改为存在collection1 就正常通过。

所以有这样的错误一般是配置错误，或者操作的core核心不存在，或者没有配置对应的handler。都是路径错误，或者用法上的错误。

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public class CreateIndexFromPDF {
public static void main(String[] args)
    {
        String fileName = "E:/apache-solr-ref-guide-4.4.pdf";
        String solrId = "solr用户指南中文版.pdf";
        try
        {
            indexFilesSolrCell(fileName, solrId);
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
        catch (SolrServerException e)
        {
            e.printStackTrace();
        }

    }

    /** 从文件创建索引
     * <功能详细描述>
     * @param fileName
     * @param solrId
     * @see [类、类#方法、类#成员]
     */
    public static void indexFilesSolrCell(String fileName, String solrId)
        throws IOException, SolrServerException
    {
        String urlString = "http://localhost:8080/solr/core0";
        SolrServer solr = new HttpSolrServer(urlString);
        ContentStreamUpdateRequest up = new ContentStreamUpdateRequest("/update/extract");

        String contentType="application/pdf";
        up.addFile(new File(fileName), contentType);
        up.setParam("literal.id", solrId);
        up.setParam("uprefix", "attr_");
        up.setParam("fmap.content", "attr_content");
        up.setAction(AbstractUpdateRequest.ACTION.COMMIT, true, true);

        solr.request(up);

        QueryResponse rsp = solr.query(new SolrQuery("*:*"));
        System.out.println(rsp);
    }
}