Support multiline headers in HTTP parsing

[ianbotsf]

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Describe the Feature

The current HTTP layer via ktor-http-cio does not support parsing multiline headers (because they are deprecated) or paths with spaces in them. We should make our parsing layer capable of handling these edge cases.

Is your Feature Request related to a problem?

The lack of parser flexibility means that some of the SigV4 signing suite tests have to be disabled (get-header-value-multiline, get-space-normalized, and get-space-unnormalized).

Proposed Solution

Possibly replace ktor-http-cio as the HTTP layer.

Describe alternatives you've considered

(none)

Additional Context

(none)

• I may be able to implement this feature request

[jason-weddington]

Need to investigate the current state after moving away from ktor.