code: public String getRequstURIPath(String prefix, String defvalue) {
          if (requestURI == null || prefix == null || prefix.isEmpty()) return defvalue;
          int pos = requestURI.indexOf(prefix);
          if (pos < 0) return defvalue;
          String sub = requestURI.substring(pos + prefix.length());
          pos = sub.indexOf('/');
          return pos < 0 ? sub : sub.substring(0, pos);
      }
docs: 获取请求URL分段中含prefix段的值   <br>
  例如请求URL /pipes/record/query/name:hello   <br>
  获取name参数: String name = request.getRequstURIPath("name:", "none");
  
  @param prefix   prefix段前缀
  @param defvalue 默认值
  
  @return prefix截断后的值