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I have a sharepoint site hosted at:

https://xxxxx.sharepoint.com, which has a subsite named abc

when I type in https://xxxx.sharepoint.com/abc in the browser, it redirects to the welcome page of the subsite automatically, which is https://xxxxx.sharepoint.com/abc/Pages/Home.aspx.

But when I try to access this subsite using postman, it does not redirects to the welcome page by itself, even if I try to access the welcome page like this: https://xxxxx.sharepoint.com/abc/Pages/Home.aspx by using the oauth2 token, it gives error 401 unauthorized.

How to access the home page of a sharepoint subsite from postman and retrieve its HTML?

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The Url of the designated "default" or "home" page is stored in a property named WelcomePage. To retrieve this value from a REST call, perform a GET "<<subsiteurlhere>>/_api/web/rootfolder?$select=welcomepage". Since it is a GET request, you can even test this in the browser, for example: 

https://xxxxx.sharepoint.com/sites/abc/subweb1/_api/web/rootfolder?$select=welcomepage

Also note, that if you performed Oauth to get your token from the parent site, depending on how your permissions are configured, you may have to re-authenticate to get a valid token for the subsite.

Update from comments:

Hit the REST endpoint in browser tab like below and check if this works for you before using it in postman:

enter image description here

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  • Tried it, like this xxxx.sharepoint.com/abc/pages/_api/web/…, but it gives me error this error: {"error_description":"Invalid issuer or signature."}. Using oauth2 Password credentials flow .
    – Surbhi Babbar
    Commented Mar 2, 2020 at 11:49
  • "/pages" is not part of your web URL
    – willman
    Commented Mar 2, 2020 at 12:07
  • shall it be literally used like this: xxx.sharepoint.com/abc/subweb1/_api/web/…
    – Surbhi Babbar
    Commented Mar 2, 2020 at 12:10
  • Also, how to handle error 401 . It shows me this in the response headers: x-ms-diagnostics →3000006;reason="Token contains invalid signature.";category="invalid_client"
    – Surbhi Babbar
    Commented Mar 2, 2020 at 12:10
  • The part that comes before the "_api" should only include the path to your site or subsite. Library or lists should not be in the base path. So if your site is xxxx.sharepoint.com/sites/abc, and the "abc" site has a subsite named subweb1, then the API call would be https://xxxxx.sharepoint.com/sites/abc/subweb1/_api/web/rootfolder?$select=welcomepage. Of course, you want to use real address of your site and subsite.
    – willman
    Commented Mar 2, 2020 at 12:21

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