ProtocolURI path component in DRLs MUST be base64url encoded

[LiranCohen]

Through testing apps and DRLs we've concluded that base64url encoding the protocol URI in the path segments is best.

We particularly ran into this issue with nginx https://trac.nginx.org/nginx/ticket/786 where nginx decides to decode then re-encode the path segment which removes one of the slashes from the protocol URI.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 80.32787% with 12 lines in your changes missing coverage. Please review.

Project coverage is 94.92%. Comparing base (295be4a) to head (5f9f2ff).

Files with missing lines	Patch %	Lines
src/http-api.ts	80.32%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #168      +/-   ##
==========================================
+ Coverage   94.89%   94.92%   +0.03%     
==========================================
  Files          28       28              
  Lines        2956     2976      +20     
  Branches      397      401       +4     
==========================================
+ Hits         2805     2825      +20     
  Misses        150      150              
  Partials        1        1              

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