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Shared File Link Issues
Hi,
I'm writing to find out if anyone knows of any changes to the Drop Box service around 2/9, 2/10 that may have changed how file information is shared when using the Shared Link. For con...
Greg-DB wrote:...
In this HTTP 2 sample, the final 200 does have "Content-Length".
Just one addition to avoid confusion: There is temporary rollback, that's why "Content-Length" just appear without workaround! 😜 That gonna change at March beginning. 😉
mbvistaprint, you can see in the Greg-DB's post for HTTP/1.1 where X-Dropbox-Content-Length appear and you can use it, temporary at least (it's presence isn't guaranteed).
One more workaround example is usage of Range declaration and getting result out of Range header in response. 3 responses follow with setted "Range: bytes=0-0" (you can see where actual length is and this always works 😉) for HTTP/1.0, HTTP1.1, and mHTTP2:
HTTP/1.0 206 Partial Content Accept-Ranges: bytes Cache-Control: max-age=60 Content-Disposition: attachment; filename="SelfExamCardInside.jpg"; filename*=UTF-8''SelfExamCardInside.jpg Content-Range: bytes 0-0/4006971 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Content-Security-Policy: sandbox Etag: 1627768410839975d Pragma: public Referrer-Policy: no-referrer Vary: Origin X-Content-Security-Policy: sandbox X-Content-Type-Options: nosniff X-Dropbox-Content-Length: 1 X-Robots-Tag: noindex, nofollow, noimageindex X-Webkit-Csp: sandbox Content-Type: application/binary Accept-Encoding: identity,gzip Date: Tue, 15 Feb 2022 21:54:49 GMT Server: envoy Strict-Transport-Security: max-age=31536000; includeSubDomains; preload X-Robots-Tag: noindex, nofollow, noimageindex X-Dropbox-Response-Origin: far_remote X-Dropbox-Request-Id: 7daefabda8344260b029b47213fc8d53 Connection: close HTTP/1.1 206 Partial Content Accept-Ranges: bytes Cache-Control: max-age=60 Content-Disposition: attachment; filename="SelfExamCardInside.jpg"; filename*=UTF-8''SelfExamCardInside.jpg Content-Range: bytes 0-0/4006971 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Content-Security-Policy: sandbox Etag: 1627768410839975d Pragma: public Referrer-Policy: no-referrer Vary: Origin X-Content-Security-Policy: sandbox X-Content-Type-Options: nosniff X-Dropbox-Content-Length: 1 X-Robots-Tag: noindex, nofollow, noimageindex X-Webkit-Csp: sandbox Content-Type: application/binary Accept-Encoding: identity,gzip Date: Tue, 15 Feb 2022 21:54:17 GMT Server: envoy Strict-Transport-Security: max-age=31536000; includeSubDomains; preload X-Robots-Tag: noindex, nofollow, noimageindex X-Dropbox-Response-Origin: far_remote X-Dropbox-Request-Id: cdaf604d28c1485da9bff49ba955defc Transfer-Encoding: chunked HTTP/2 206 accept-ranges: bytes cache-control: max-age=60 content-disposition: attachment; filename="SelfExamCardInside.jpg"; filename*=UTF-8''SelfExamCardInside.jpg content-range: bytes 0-0/4006971 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< content-security-policy: sandbox etag: 1627768410839975d pragma: public referrer-policy: no-referrer vary: Origin x-content-security-policy: sandbox x-content-type-options: nosniff x-robots-tag: noindex, nofollow, noimageindex x-webkit-csp: sandbox content-type: application/binary accept-encoding: identity,gzip date: Tue, 15 Feb 2022 21:55:06 GMT server: envoy strict-transport-security: max-age=31536000; includeSubDomains; preload x-robots-tag: noindex, nofollow, noimageindex content-length: 1 x-dropbox-response-origin: far_remote x-dropbox-request-id: 2b03cfeb681d44da87abed089006e354
Just read and parse "content-range" header, instead "content-length" (the length is part of the range). 😉 This is cross protocol and cross site solution (will work not only for Dropbox). Just take care to ignore "content-length" here! It's obvious but, to mention: since it's a single byte range, the length (wherever you read it) will be fixed to 1 (as you can see above).
Add: Oh.. I forgot! mbvistaprint What file are you trying to check size on? To the picture that was send to you or to the preview page's HTML file?
mbvistaprintwrote:...
Content-Type: text/html; charset=utf-8
...
🤔 Take little bit more care! It's dynamic content and that's why there is not size in advance. Even if you where able to get something, it would be wrong for sure! It's just NOT the desired file. 🙂 Replace the ending "?dl=0" to "?dl=1" or "?raw=1". That's it. 😉 All above examples use "?dl=1" - all but the your.
Greg-DB
Dropbox Community Moderator
Dropbox Community ModeratorTo elaborate a bit on some of what Здравко was saying, note that in order to temporarily accommodate clients that don’t properly support automatically handling “Transfer-Encoding: chunked”, we’re temporarily rolling back that change, so that these links will no longer use “Transfer-Encoding: chunked” and will instead return “Content-Length” on HTTP/1.1. We will begin rolling that out starting around 2/17. That will be in place until around 3/1. At that point, we will begin using “Transfer-Encoding: chunked” and no longer returning “Content-Length” on HTTP/1.1 again. So, in case that is the issue in your case, going forward, please ensure that your clients are able to automatically handle both chunked encoding and non-chunked encoding automatically.
Thank you! I will be discussing with my boss this afternoon how we want to handle this and will let him know about the temporary reprieve on this. Appreciate the help!
-Melissa
- Greg-DB
Update: the team has been able to complete some further updates to our infrastructure to be able to support the previous non-chunked behavior going forward indefinitely. That means that we plan to continue returning Content-Length (and not 'Transfer-Encoding: chunked') in the future and will not be reverting this as previously planned. (Regardless, for HTTP compatibility in general, we still recommend you make sure your HTTP clients support both types.) Hope this helps!
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