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Power Automate
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SSRS to PDF using Power Automate Flow - Error "The length of substring can't be longer than '40965'"

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Posted on by Ali1001

Hello,

I have created a power automate flow to execute SSRS report and create a pdf copy of that report. While executing, flow is throwing an error as below:  

ali_betach_0-1673569119915.png

The expression used in this action is as below: 

replace(substring(outputs('Invoke_an_HTTP_request')?['body'],outputs('PDF_Download_start_-_Index'),outputs('PDF_Download_String_Length')),'\u0026','&')
 
Above expression is using output from two other actions as below:
ali_betach_1-1673569382258.png

Expression: 

add(indexOf(outputs('Invoke_an_HTTP_request')?['body'],'"PdfDownloadUrl":"'),18)
 
ali_betach_2-1673569425489.png

Expression: 

sub(indexOf(outputs('Invoke_an_HTTP_request')?['body'],'","PdfPreviewUrl"'),outputs('PDF_Download_Start_-_Index'))
 
During investigation I found action "PDF Download String Length" is returning negative value i.e. -18 
ali_betach_3-1673569567670.png

This is because the first portion of the expression from action "PDF Download String Length" is returning -1 value

First portion of the expression: indexOf(outputs('Invoke_an_HTTP_request')?['body'],'","PdfPreviewUrl"')

 

Below is the HTTP POST action 

ali_betach_4-1673569813821.png

 

From this point I have no idea how to resolve this and what is causing it.

 

Any help would be GREATLY appreciated 🙂

 

Thanks,

Ali

 

 
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Building flows
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