Solr error - The request sent by the client was syntactically incorrect (null)

Question

When sending long queries to solr like this:

q=(CC%3a((1)+ ... +(n)))&rows=100000000&fl=CP

I am constantly getting this message:

400 Bad request message.

When I investigated further using fiddler I am actually getting:

the request sent by the client was syntactically incorrect (null)

When I reduce the number of parameters this query works, but when I increase to a certain limit I get the above error.

Earlier I was using GET solr queries and I increased the maxHttpHeaderSize but I still get the same result. I then used POST solr queries, increased the maxPostSize and it also gave the same result.

Can someone help, what am I doing wrong?

Answer 1

Found the fix. Just increase the Maximum number of clauses in each BooleanQuery parameter

../conf/solrconfig.xml
<maxBooleanClauses>134217728</maxBooleanClauses>