CardDAV synchronization with DAVx⁵ fails because contact href URLs end with a trailing slash
Problem reported by Schroeder Robert - 10/6/2026 at 3:44 AM
Resolved

Hello,

Smartermail version 9770 and 9756
I am experiencing a CardDAV synchronization issue between SmarterMail and DAVx⁵ on Android.
Calendar synchronization via CalDAV works correctly, but contact synchronization via CardDAV fails.
After enabling WebDAV logging in SmarterMail and comparing the server response with the DAVx⁵ debug log, I found that SmarterMail returns contact resource URLs with a trailing slash after the .vcf filename.
For example, SmarterMail returns the following in the WebDAV 207 Multi-Status response:
<d:response>
    <d:href>/webdav/addressbooks/Schroeder.mobi/robert/5e259c962ae14781ae8ee1069c97e1a2/74d1acdcee9f48e7a3bbc5459026f70e.vcf/</d:href>
    <d:propstat>
        <d:status>HTTP/1.1 200 OK</d:status>
        <d:prop>
            <d:resourcetype />
            <d:getetag>17782640934913</d:getetag>
        </d:prop>
    </d:propstat>
</d:response>
The important part is:
74d1acdcee9f48e7a3bbc5459026f70e.vcf/
There is a trailing / after .vcf.
This occurs for all contact resources returned by SmarterMail, for example:
74d1acdcee9f48e7a3bbc5459026f70e.vcf/
3f83f090d95546f6b453d760a093212b.vcf/
6530353b612145c4bbd08dc27078a7ea.vcf/
bee0cbc5c78f44c9b2bbc39935777856.vcf/
At the same time, SmarterMail correctly returns an empty <d:resourcetype /> for these resources, indicating that they are not collections.
DAVx⁵ 4.5.20 then aborts the contact synchronization with the following exception:
java.lang.IllegalArgumentException:
Not a member URL (path is empty or ends with a slash)
The address book collection itself correctly ends with /, which is expected:
/webdav/addressbooks/Schroeder.mobi/robert/5e259c962ae14781ae8ee1069c97e1a2/
However, individual .vcf resources appear to be returned as if their URLs were collections because of the trailing slash.
Could you please confirm whether this is a known CardDAV issue in SmarterMail and whether a fix or workaround is available?
I can provide the complete SmarterMail WebDAV log and the DAVx⁵ debug log if required.
Thank you.
Schroeder Robert Replied
Marked As Resolution
Solved with Build 9777
Tim Uzzanti Replied
Employee Post

It was fixed based on your community post.  Thanks for bringing it to our attention.

Tim Uzzanti
CEO
SmarterTools Inc.

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