Bad_Start_Url error is returned when auth provider URL receives a relative path that contains white spaces or invalid characters
Trailblazer Community

Bad_Start_Url error is returned when auth provider URL receives a relative path that contains white spaces or invalid characters

Authentication , Communities , Summer 16

Last updated 10 days ago ·Reference W-3315426 ·Reported By 11 users

Fixed - Winter '21

When the URL decoded value of startURL contains a relative path with white spaces or invalid characters (e.g. éá) before the first existing question mark, "Bad_Start_Url, startURL was not a relative path or contained invalid characters" is thrown when redirected to the auth provider servlet.

1) Create a Google auth provider. Any auth provider will do.

2) Create a Community using the Customer Service (Napili) template, and configure the created auth provider at Community Management | Administration | Login & Registration.

3) Navigate to Community Builder and remove the "Featured Topics & Feeds" component from the Home page. This is to allow you to navigate to the community home page as a guest user.

4) Publish the community, and wait for an email to confirm that the community has been published.

5) Navigate to the community as a guest user (e.g. use an incognito tab to open the community login URL).

6) Navigate to a page where white spaces or invalid characters are going to be added to the page URL. For example:

6.1) Search for a piece of text with white spaces in the expression. e.g.: "a b". The search results page will be displayed and the URL will contain the text you just searched; OR

6.2) Click on any question that contains invalid characters. e.g.: "éá". The title of the question will be added to the URL.

7) Click Login and you'll be redirected to


Notice startURL is the result of URL encoding this relative URL:


8) Click Google to use this auth provider. This will throw the Bad_Start_Url error.

Log into the auth provider before navigating to a page with white spaces or invalid characters in its URL.

Is it Fixed?

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