File _service of Package couchdb

<services>
 <service name="download_url">
   <param name="protocol">http</param>
   <param name="host">www.apache.org</param>
   <param name="path">/dist/couchdb/source/2.3.1/apache-couchdb-2.3.1.tar.gz</param>
 </service>
 <service name="verify_file">
   <param name="file">_service:download_url:apache-couchdb-2.3.1.tar.gz</param>
   <param name="verifier">sha256</param>
   <param name="checksum">43eb8cec41eb52871bf22d35f3e2c2ce5b806ebdbce3594cf6b0438f2534227d</param>
 </service>
</services>