AssembleIndexCompleter creates the autocompletion index for REPL.

Format formats the HTTPResponse to the output io.Writer.

NewInputParser initializes the parser and validates the input.

Completer has the initial list for the interactive completions.

SupportedMethods is the list of defined suported HTTP verbs that the application supports, it's also used for bash autocompletion.

InputParser is the struct that parses the input into something usable by the application.