Custom Connector BUG

[Anonymous]

Dear community,

Recently I encoutered a bug when creating a custom connector that is .. very peculiar. Please consider the following reproduction scenario.

-Create a new custom connector, and replace the logic in the contents methods with the following ( feel free to take any API you'd like it doesn't matter for the bug ) :

let
url="https://api.publicapis.org",
path="/entries",
source = Web.Contents(url,[Headers=[#"Content-type"="application/json",
RelativePath=path]]),
responseHeaders= Value.Metadata(source)[Headers]
in
responseHeaders;

- Test the connector ( first specifying the credentials as anonymous offcourse ), and observe how several header fields are displayed.

- Paste the following method before the content method ( but after the line specifying the datasource kind and publish) :

shared aap=()=>
let
aap="noot"
in
aap;

- Please test the connector again, after specifying the credentials again please observe how the headers have been reduced to just the content type. When using an external tool like Fiddler, please note that the headers actually are still there but simply not seen ( or something like that ) by the connector. This behaviour will also happen when the connector is used in PowerBI.

I encoutered this bug with a different API, but the behaviour is odd. And it took me quite some time to figure out what exactly triggered this. I can't think of an explanation for this, so I'm eager to hear what's going on ... 

kind regards,

Vincent Klijs

[Anonymous]

Hi @Anonymous ,

For better help.

Based on the above information, if you are a Power BI Pro licensee, you can create a support ticket for free and a dedicated Microsoft engineer will come to solve the problem for you.
It would be great if you continue to share in this issue to help others with similar problems after you know the root cause or solution.

The link of Power BI Support: Support | Microsoft Power BI

For how to create a support ticket, please refer to How to create a support ticket in Power BI - Microsoft Power BI Community

Best Regards,
Community Support Team _ Caitlyn

[Anonymous]

Dear Caitlyn,

Thank you the reply, I genuinely didn't know about the option to raise support tickets. I have created a ticket, hopefully it can be solved ( if not for me, then for future users! )

kind regards,

Vincent

[Anonymous]

Dear all,

It turned out that the issue I was facing, wasn't an issue at all. The syntax for the custom connector is more limited that I knew, and thus the behaviour I observed was intented ... Please see https://github.com/microsoft/DataConnectors/issues/513 for more details on this.

I do think that the tutorials on this subject could be improved ...

kind regards,

Vincent