When Solr RequestHandlers are accessed using path based URLs, the
SolrQueryRequest object containing the parameters of the request may also contain a list of ContentStreams containing bulk data for the request. (The name SolrQueryRequest is a bit misleading: it is involved in all requests, regardless of whether it is a query request or an update request.)
Currently RequestHandlers can get content streams in a variety of ways:
- For multipart file uploads, each file is passed as a stream.
- For POST requests where the content-type is not
application/x-www-form-urlencoded, the raw POST body is passed as a stream. The full POST body is parsed as parameters and included in the Solr parameters.
- The contents of parameter
stream.bodyis passed as a stream.
- If remote streaming is enabled and URL content is called for during request handling, the contents of each
stream.fileparameters are fetched and passed as a stream.
By default, curl sends a
contentType="application/x-www-form-urlencoded" header. If you need to test a SolrContentHeader content stream, you will need to set the content type with the "-H" flag.
Remote streaming lets you send the contents of a URL as a stream to a given SolrRequestHandler. You could use remote streaming to send a remote or local file to an update plugin. For convenience, remote streaming is enabled in most of the example
solrconfig.xml files included with Solr, however it is not recommended in a production situation with out additional security between you and untrusted remote clients.
The default behavior, when
enableRemoteStreaming is not specified in
solrconfig.xml is to not allow remote streaming (i.e.,
enableRemoteStreaming="true" is used, be aware that this allows anyone to send a request to any URL or local file. If DumpRequestHandler is enabled, it will allow anyone to view any file on your system.
The implicit "dump" RequestHandler (see Implicit RequestHandlers) simply outputs the contents of the SolrQueryRequest using the specified writer type
wt. This is a useful tool to help understand what streams are available to the RequestHandlers.