The purpose of this simple service is to help route WARC file requests to the right file.
This was used to generate the json index information
warcio index -f offset,length,filename,warc-type,warc-target-uri test_warcs/wikipage.warc.gz
424957+35730-1 = 460686
curl -v -r 424957-460686 http://localhost:8008/by-filename/wikipage.warc.gz | gunzip -