var page = context.Web.GetFileByServerRelativeUrl(FileName);

When this is executing I am getting an error:

Specified value is not supported for the serverRelativePath parameter

I am giving full file path in this call.

2 Answers 2


Use ServerRelativeUrl, eq. /sites/site/libraryname/folder/filename.ext. Function returned File object.

  • are you saying that instead of https://<companyName>.sharepoint.com/MyLIb/MyFolder/MyFile.txt we have to mention only path like ('companyName.sharepoint.com/MyLib/MyFolder/MyFile.txt')?
    – TechTurtle
    Commented Feb 12, 2019 at 20:15
  • In your case /MyLib/MyFolder/MyFile.txt will be the ServerRelativeUrl. See my answer below.
    – Pavel Sem
    Commented Apr 17, 2020 at 9:56

ServerRelativeUrl is everything after domain name but needs to start with /.

// url -> https://microsoft.sharepoint.com/teams/<sitename>/<libraryname>

var serverRelUrl = context.Web.ServerRelativeUrl;
// returns /teams/<sitename>

So for file it will be in above sample /teams/<sitename>/<libraryname>/folder/subfolder/file.txt

  • 1
    A huge piece of this for me was that it needed to start with /.
    – Mike
    Commented Jun 11, 2021 at 10:13
  • me too, a lot head-scratching on that one!
    – James
    Commented Dec 10, 2021 at 15:19

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