I'm currently connecting to a web data source using API Key passed as a header in my URL. Works fine in PowerBI desktop.
I'm trying to create scheduled refresh using personal gateway however am getting invalid credentials error.
Any idea's how to pass my API Key as part of the URL when adding my Web data source to gateway?
First, it is no need to use a gateway when you data source is online as power bi service is a online service.
Just edit credentials for your data source,
If this doesn't help, here is a similar issue regarding refreshing the data source in Power BI Service when passing parameter in URL, you may check the suggestions discussed under it.
Have tried achanging credentials back to Anonymous (as it is in PowerBI desktop) but still the same error when refreshing.
Have read the forum in the link you've provided but is throwing error with datasource in my inital query now. My Query looks like this:
Json.Document(Web.Contents("https://APIURL/440701" & "/event.json" & "?EventTypeCode=N102" & "&FromDate=2018-01-01" & "&take=1000", [Headers=[#"x-ApiKey"="APIKEY"]]))
Which error does it throw?
Is something wrong with your code?
Regarding how to Specifying JSON Query in Power Query, please refer to the link.
Please go to data source setting->edit permission to see the type of credential.
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