Allows HTTP access to IPFS files and directories. An IPFS Gateway acts as a bridge between traditional web browsers and IPFS. Through the gateway, users can browse files and websites stored in IPFS as if they were stored in a traditional web server. If Qmhash is a directory and it contains an index.html file, then the file is served. Otherwise, a listing of the directory is served. To force a directory listing, end the Qmhash with a forward slash.