@Test
  public void appendWithVarargsQueryParamsWithExistingParams() {
    assertEquals("http://test.com/1?a=b&c=d",
        HttpRequest.append("http://test.com/1?a=b", "c", "d"));
    assertEquals("http://test.com/1?a=b&c=d",
        HttpRequest.append("http://test.com/1?a=b&", "c", "d"));
  }
Append with base URL already containing a '?'
lib/src/test/java/com/github/kevinsawicki/http/HttpRequestTest.java