fix: http redirect for /piece/ in booster-http

[LexLuthr]

$ curl -v "http://localhost:7777/piece?payloadCid=QmbSLYv6EbbctX5MCuUR6PLxh2sCZLVg5JsUsEMy86tXD2&format=car" --output /tmp/out.car
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0* Trying 127.0.0.1:7777...

• TCP_NODELAY set
• Connected to localhost (127.0.0.1) port 7777 (#0)

GET /piece?payloadCid=QmbSLYv6EbbctX5MCuUR6PLxh2sCZLVg5JsUsEMy86tXD2&format=car HTTP/1.1
Host: localhost:7777
User-Agent: curl/7.68.0
Accept: /

• Mark bundle as not supporting multiuse
  < HTTP/1.1 301 Moved Permanently
  < Content-Type: text/html; charset=utf-8
  < Location: /piece/?payloadCid=QmbSLYv6EbbctX5MCuUR6PLxh2sCZLVg5JsUsEMy86tXD2&format=car
  < Date: Wed, 16 Nov 2022 08:45:17 GMT
  < Content-Length: 115
  <

By default, mux handler removes the succeeding "/" and incorrect URL format is also served after a redirect. A strict client side check reveals the problem.

[dirkmc]

A couple of suggestions to clean up the code, but overall looks good to me 👍

Feel free to merge when the cleanup is done.