Error handling double url-encoded forward slashes

There seems to be a bug when a path has two url-encoded forward slashes.

The following fails with a 404:

try {
  String fetchUrl = "http://data.bioontology.org/ontologies/SNOMEDCT/classes/http%3A%2F%2Fpurl.bioontology.org%2Fontology%2FSNOMEDCT%2F48015001/mappings";
  try (CloseableHttpClient httpClient = HttpClients.createDefault()) {
    HttpUriRequest request = RequestBuilder.get()
        .addParameter("apikey", "my-api-key")
        .setUri(fetchUrl)
        .build();
    try (CloseableHttpResponse httpResponse = httpClient.execute(request)) {
      if (httpResponse.getStatusLine().getStatusCode() != 200) {
        throw new Exception("Request to " + fetchUrl + " did not succeed with code " + httpResponse.getStatusLine().getStatusCode());
{

}}
      System.out.println("got it");
{

}}
} catch (Exception ex) {
  ex.printStackTrace();
}

When running with debug logging, I see:

[org.apache.http.headers] : http-outgoing-0 >> GET /ontologies/SNOMEDCT/classes/http:/purl.bioontology.org/ontology/SNOMEDCT/48015001/mappings?apikey=foo HTTP/1.1

It should instead be getting: /ontologies/SNOMEDCT/classes/http://purl.bioontology.org/ontology/SNOMEDCT/48015001/mappings?apikey=foo

(2 slashes after http: instead of 1)

This worked just fine in 4.5.6.

Updated - edited formating.