title: Problems with white space in solr
body: <p>I have this query to a <em>solr4.8.0</em> server (using <code>curl</code>):</p>
  <pre><code>curl -g &quot;http://192.168.0.70:8983/solr/solr_db/select?q=*:*&amp;fl=some,fields,here&amp;start=0&amp;rows=5&amp;fq=first_filter:first_value&amp;fq=time_filter:[2016-11-21T22:00:00Z%20TO%202016-11-22T21:59:59Z]&amp;fq=third_filter:third-value&amp;fq=forth_filter:forth%20value&quot;
  </code></pre>
  <p>As you can see, for the forth query filter (<code>forth_filter:forth%20value</code>), there is a value which contains white space. I escaped this using the URL escape method (<code>%20</code>). I used before this escape with <code>time_filter</code>.</p>
  <p>This query gives an error:</p>
  <blockquote>
  <p>&quot;error&quot;:{</p>
  <p>&quot;msg&quot;:&quot;no field name specified in query and no default specified via 'df' param&quot;,</p>
  <p>&quot;code&quot;:400}</p>
  <p>}</p>
  </blockquote>
  <p><strong>Problem description</strong>:
  The error is due to <code>forth_filter</code>. I know this because if I remove it, everything works. And also, if I remove all other filters, but keep it, it still doesn't work, resulting in the same error.
  Can anybody guide me how to fix this problem?</p>
  <p>N.B. I'm querying <em>solr</em> via <em>PHP</em>, but in order to fix this, I try it via <code>curl</code> first. Querying via PHP library, gives the same error output.</p>