Re: Adding HTTP Request Header in SolrJ

[Shawn Heisey]

On 2/3/2014 3:40 PM, Andrew Doyle wrote:

Our web services are using PKI authentication so we have a user DN, however
we're querying an external Solr which is managed via a proxy which is
expecting our server DN proxying the user DN. My question is, how do we add
an HTTP header to the request being made by SolrJ?

I looked through the source code and I see that we can specify an
HttpClient when we create a new instance of an HttpSolrServer. I can set
the header there, but that seems slightly hackey to me. I'd prefer to use a
servlet filter if possible.

Do you have any other suggestions?


I don't think there's any servlet information (like the filters you 
mentioned) available in SolrJ.  There is in Solr itself, which uses 
SolrJ, but unless you're writing a servlet or custom server side code 
for Solr, you won't have access to any of that.  If you are writing a 
servlet or custom server-side code, then they'll be available -- but not 
from SolrJ.


I could be wrong about what I just said, but just now when I looked 
through the code for HttpSolrServer and SolrServer, I did not see 
anything about servlets or filters.


In my own SolrJ application, I create an HttpClient instance that is 
used across dozens of HttpSolrServer instances. The following is part of 
the constructor code for my custom "Core" class.


/*
 * If this is the first time a Core has been created, create 
the shared
 * httpClient with some increased connection properties. 
Synchronized to

 * ensure thread safety.
 */
synchronized (firstInstance)
{
if (firstInstance)
{
ModifiableSolrParams params = new ModifiableSolrParams();
params.add(HttpClientUtil.PROP_MAX_CONNECTIONS_PER_HOST, "200");
params.add(HttpClientUtil.PROP_MAX_CONNECTIONS, "5000");
httpClient = HttpClientUtil.createClient(params);
firstInstance = false;
}
}

These are the static class members used in the above code:

/**
 * A static boolean value indicating whether this is the first 
instance of

 * this object. Also used for thread synchronization.
 */
private static Boolean firstInstance = true;

/**
 * A static http client to use on all Solr server objects.
 */
private static HttpClient httpClient = null;

Just so you know, the deprecations introduced by the recent upgrade to 
HttpClient 4.3 might complicate things further when it comes to user 
code.  See SOLR-5604.  I have some ideas about how to proceed on that 
issue, but haven'thad a lot of time to look into it, and before I do 
anything, I need to discuss it with people who are smarter than me.


https://issues.apache.org/jira/browse/SOLR-5604

Thanks,
Shawn

Adding HTTP Request Header in SolrJ

[Andrew Doyle]

Our web services are using PKI authentication so we have a user DN, however
we're querying an external Solr which is managed via a proxy which is
expecting our server DN proxying the user DN. My question is, how do we add
an HTTP header to the request being made by SolrJ?

I looked through the source code and I see that we can specify an
HttpClient when we create a new instance of an HttpSolrServer. I can set
the header there, but that seems slightly hackey to me. I'd prefer to use a
servlet filter if possible.

Do you have any other suggestions?

Thanks!


*-- Andrew Doyle*
Software Engineer II

 

10620 Guilford Road, Suite 200
Jessup, MD 20794
direct: 410 854 5560
cell: 410 440 8478

*ado...@clearedgeit.com *
* www.ClearEdgeIT.com *