URL is rewritten and port is added before jarcache.json lookup #287

On 0.12.3, I was trying to decode a json+ld with

"@context": "https://schema.org"

So I added the following to jarcache.json

  {
    "Content-Location": "http://schema.org",
    "X-Classpath": "jsonldcontext.json",
    "Content-Type": "application/ld+json"
  }

This did not work as expected, the cache was not used. After odious debugging I found the cache was searched with the port number added, so I could produce a cache hit only with the following entry:

  {
    "Content-Location": "https://schema.org:443/",
    "X-Classpath": "jsonldcontext.json",
    "Content-Type": "application/ld+json"
  }

This is certainly unexpected. Why rewrite the URL before cache lookup? Also the documentation suggests, that the port number is not necessary. Please fix this.