how to make a file to force download in dropbox sdk

问题

I am using dropbox php sdk and i want to download the file through the browser . I have a file preview link But away to understand how can i download the file . I am using the function

function GetLink($dropbox_file, $preview=true, $short=true, &$expires=null)
    {
        if(is_object($dropbox_file) && !empty($dropbox_file->path)) $dropbox_file = $dropbox_file->path;
        $url = $this->apiCall(($preview?"shares":"media")."/$this->rootPath/$dropbox_file", "POST", array('locale' => null, 'short_url'=> $preview ? $short : null));
        $expires = strtotime($url->expires);
        return $url->url;
    }

and this is producing a link to preview the file like https://db.tt/S3znA2kE and if i open this link it becomes https://www.dropbox.com/s/64h549xaofsm67p/readme.txt i know file can download if i will pass ?dl=1 but can't understand HOW

回答1:

Two possibilities:

You could stop passing "true" in the short parameter and thus get a long URL to start with. Then you can just use the dl=1 parameter directly.

If, for some reason, you need to get a short URL, you could then expand it by doing an HTTP HEAD and looking at the returned Location header. E.g. (using curl):

$ curl -I https://db.tt/S3znA2kE
HTTP/1.1 302 FOUND
Server: nginx
Date: Thu, 07 Aug 2014 21:16:19 GMT
Content-Type: text/html; charset=utf-8
Connection: keep-alive
location: https://www.dropbox.com/s/64h549xaofsm67p/readme.txt
pragma: no-cache
cache-control: no-cache

After you have the full expanded URL, you can modify it to use the dl=1 parameter.

回答2:

Then you might need to crawl actual url using this example or I think you can grab content and point within DOM and swing back to url.

来源：https://stackoverflow.com/questions/25180080/how-to-make-a-file-to-force-download-in-dropbox-sdk

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