How to get file name in http response?

Question

I am using apex code to get file from url and able to insert it as attachment. I would like to know file name as well while insert ?

When I open link in chrome it save the file with file name.

public void getAndAttachFile(String recId, String fileId) {


    // Instantiate a new http object
    Http h = new Http();
    // Instantiate a new HTTP request, specify the method (GET) as well as the endpoint
    HttpRequest req = new HttpRequest();
    req.setEndpoint('https://secure.basecone.com/Lookup/Download?externalId='+fileId);
    req.setTimeout(60000);//sets maximum timeout
    req.setMethod('GET');
    HttpResponse res = h.send(req);
    Blob body = res.getBodyAsBlob();

    // **Here I want to set actual file name in Name field**
    Attachment att = new Attachment(Name = fileId, Body = body, ParentId=recId);
    insert att;

}

Answer 1

This information is contained in the response header. A bit of parsing is required:

String fileName = 'default name';
Pattern p = Pattern.compile('.+filename="(.+?)".*');
String contentDisposition = res.getHeader('Content-Disposition');
if(contentDisposition != null) {
  Matcher m = p.matcher(contentDisposition);
  if(m.find()) {
    fileName = m.group(1);
  }
}