[SOLVED] Dropbox v2 // listfolder() returns Curl-Error 51

[dennisheiden]

Dropbox Api Version: 2
SDK Version: latest (composer download / 2017-12-01)

Call:
$dropbox->listFolder("");

Warning: cURL error 51: SSL: no alternative certificate subject name matches target host name 'api.dropboxapi.com' (see http://curl.haxx.se/libcurl/c/libcurl-errors.html)

Getting this message right now, don't know if something on the dropbox side changed, my api call worked hours before.

When I change api.dropboxapi.com to api.dropbox.com, the listFolder() function works but the download() returns:

Incorrect host for API function files/download. You must issue the request to content.dropboxapi.com

[dennisheiden]

Answer from Greg from Dropbox Support:
https://www.dropboxforum.com/t5/API-support/PHP-files-list-folder-returns-Curl-Error-51/m-p/254919

The api.dropboxapi.com host is currently being served with a valid certificate, so it's not clear why your client isn't trusting it. (Is there any security software, e.g., firewall, or a proxy that may be intefering?)

In any case, the /2/files/list_folder endpoint does need to be called on the Dropbox API servers, for which either of these host names are valid:
api.dropbox.com
api.dropboxapi.com

The /2/files/download endpoint does need to be called on the Dropbox API content servers, for which either of these host names are valid:
api-content.dropbox.com
content.dropboxapi.com

(Note that at the end of your post you mentioned "content.dropbox.com isn't available in v2". That is true in that "content.dropbox.com" is not a valid host name, but "content.dropboxapi.com" is valid and does serve API v2.)

[dennisheiden]

SOLVED

The issue was in the DropboxClient.php of the SDK. the content_path was not content.dropboxapi.com .
Even after my reinstallation via composer. The GIT file is already correct: (Line 23)

https://github.com/kunalvarma05/dropbox-php-sdk/blob/master/src/Dropbox/DropboxClient.php