“没有重载需要2个参数”，但IntelliSense显示带有2个参数的重载(“No overload takes 2 arguments” but IntelliSense shows overload with 2 arguments)

 如果您只是想获取网址，并且没有其他理由坚持使用OCamlnet，那么您可以使用curl库，这将解决所有注意事项： 
 
 let fetch fname url =
  let fd = open_in fname in
  let write s = Out_channel.output_string fd s; String.length s in
  let conn = Curl.init () in
  Curl.set_writefunction conn (write);
  Curl.set_failonerror conn true;
  Curl.set_followlocation conn true;
  Curl.set_url conn url;
  Curl.perform conn;
  Curl.cleanup conn;
  close_out fd
 
 它将获取curl支持的任何URL，包括https 

If you just want to get the url, and have no other reasons to stick with OCamlnet, then you can just use curl library, that will take care of all caveats:
 
 let fetch fname url =
  let fd = open_in fname in
  let write s = Out_channel.output_string fd s; String.length s in
  let conn = Curl.init () in
  Curl.set_writefunction conn (write);
  Curl.set_failonerror conn true;
  Curl.set_followlocation conn true;
  Curl.set_url conn url;
  Curl.perform conn;
  Curl.cleanup conn;
  close_out fd
 
It will fetch any url supported by curl, including https