cdm/src/main/java/ucar/nc2/stream/CdmRemote.java
public static String canonicalURL(String urlName) {
    if (urlName.startsWith("http:"))
      return SCHEME + urlName.substring(5);
    return urlName;
  }
public static String canonicalURL(String urlName) {
    if (urlName.startsWith("http:"))
      return SCHEME + urlName.substring(5);
    return urlName;
  }
Create the canonical form of the URL.
If the urlName starts with "http:", change it to start with "cdmremote:", otherwise
leave it alone.

@param urlName the url string
@return canonical form