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Power Platform Community / Forums / Power Automate / Bug: double encoding o...
Power Automate
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Bug: double encoding of default query parameters in Custom Connectors

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--Steps to reproduce--

1) make.powerautomate.com -> Data -> Custom Connector -> New custom connector -> Create from Blank

2) Give it an arbitrary name

3) Set "Host" on "1.General" to something that you can monitor (to analyse incoming requests)

4) Create a new action on "3.Definition" with arbitrary "Operation Id"

5) Request->Import from sample -> set "Verb" to 'GET' and  "URL" to '/?key='

6) Request->Query->key->Edit -> set "Default Value" to '/hello='

7) Create Connector

8.)5.Test -> Test operation (if necessary, Create Connection)

9)Analyse the received request on your host machine

 

--Expected result--

Shoud have received query parameter '?key=%2Fhello%3d'

Since '/' is '%2F' and '=' is '%3d', this is the expected output

 

--Actual result--

Received query parameter '?key=%252Fhello%253d'

Since '%' is '%25', it's clear, that the query parameter in the request is double encoded.

Like: '/hello=' --> '%2Fhello%3d' --> %252Fhello%253d'

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