Skip to main content
cancel
Showing results for 
Search instead for 
Did you mean: 

Register now to learn Fabric in free live sessions led by the best Microsoft experts. From Apr 16 to May 9, in English and Spanish.

Reply
Anonymous
Not applicable

Simple Web Datasource refresh do duplicate web request ...

Hello,

 

I would need some help to resolve an issue on my datasource.

I've a simple datasource that do a web request.

The request is done by a FetchPage functions that's look like this:

 

 

let
    FetchPage = (url as text)
    =>
         let
               jql= "project in ('TRAFRAMEWORK')",

               contents = Web.Contents(url & "/rest/api/2/search?jql=" & jql,
                                         [Query = [maxResults= "50", startAt = "0"],
                                                        Timeout=#duration(0,0,5,0)]),

               

               json = Json.Document(contents),
               Value = json[issues],
               table = Table.FromList(Value, Splitter.SplitByNothing(), null, null, ExtraValues.Error)

        in
              table
   in
       FetchPage

 

 

This functions is call by my main DataSource entry point "GetIssues" that look like this:

let
   Source = FetchPageTest(URL),
in
   #"Source"

 

When i do a Refresh on GetIssues in the power Bi Query Editor, all is ok.

If now I change the GetIssues entry point to expand the recors, something like this

 

let
    Source = FetchPageTest(URL),
    #"Column1D" = Table.ExpandRecordColumn(Source, "Column1", {"key"}, {"Column1.key"})
in
    #"Column1D"

 

When I look for Web request emit by Power BI in a proxy interceptor like Fiddler, I coud see that in the first case, PowerBI only do one request.

In the second case, when I do the Expand, I can see that PowerBI do the same request twice !

 

Did I miss something in my request ?

 

Regards,

        Laurent.

1 REPLY 1
v-sihou-msft
Employee
Employee

@Anonymous

 

As I understand, operations like "expand columns" will make the Power Query Engine recompute the a new query which will hit another web request. For more details about how Power Query engine works, please refer to a thread below:

 

https://social.technet.microsoft.com/Forums/en-US/8d5ee632-fdff-4ba2-b150-bb3591f955fb/queries-evaluation-chain

 

Regards,

Helpful resources

Announcements
Microsoft Fabric Learn Together

Microsoft Fabric Learn Together

Covering the world! 9:00-10:30 AM Sydney, 4:00-5:30 PM CET (Paris/Berlin), 7:00-8:30 PM Mexico City

PBI_APRIL_CAROUSEL1

Power BI Monthly Update - April 2024

Check out the April 2024 Power BI update to learn about new features.

April Fabric Community Update

Fabric Community Update - April 2024

Find out what's new and trending in the Fabric Community.