@Test
  public void appendWithNullMappedQueryParamValues() throws Exception {
    Map<String, Object> params = new LinkedHashMap<String, Object>();
    params.put("a", null);
    params.put("b", null);
    assertEquals("http://test.com/1?a=&b=",
        HttpRequest.append("http://test.com/1", params));
  }
Append params with null values

@throws Exception
lib/src/test/java/com/github/kevinsawicki/http/HttpRequestTest.java