associates val with key, replacing any other values

deletes all values associated with key

appends val to any other values associated with key

fast, ascii-only, case-insensitive string equality check

fast, ascii-only string case lower-er

returns the request value associated with key. if key is not found, returns empty string and nil error. if differing values are found, returns the fir

splits the given string into a slice of strings of suitable lengths for [dns.TXT](https://pkg.go.dev/github.com/miekg/dns#TXT) data

unassociates val with key, leaving any other values

fast, ascii-only, case-insensitive string prefix check

returns a *RequestValues which lazily parses body and url values

attempts to replace all non-ascii characters with ascii approximations, then removes all non-ascii characters and ascii control characters

checks if key has any non-expired values

gets the first non-expired value associated with key

gets all non-expired values associated with key

adds edns0 padding to msg so that the padded length is a multiple of blockLength

checks for edns0 in req, sets edns0 in resp

determines max udp payload size

checks if edns0 padding exists in msg

gets all keys starting with prefix

adds DNSKEY to resp if requested by req, returns true iff key was added