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Power Automate + Google Maps API: Pipe Character "|" Causing Proxy Error in Sandbox Environment

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Posted on by CU09061328-0

4

I'm having an issue with Google Maps Directions API when using it through Power Automate's HTTP action. The problem only occurs in my sandbox environment - it works fine in development environment.

The Setup

Using Google Maps Directions API endpoint:

https://maps.googleapis.com/maps/api/directions/json

With these query parameters:

origin=Sydney Opera House, Sydney NSW, Australia
destination=Surfers Paradise, Gold Coast QLD, Australia  
waypoints=optimize:true|Blue Mountains National Park, NSW, Australia|Hunter Valley, NSW, Australia|Byron Bay, NSW, Australia
key=YOUR_API_KEY

The Problem

When I include the pipe character "|" in the waypoints parameter, I get this error in Power Automate:

{
  "body": {
    "title": "Proxy execute request error",
    "status": 400,
    "detail": "ms-plex-targetServiceUrl header must be a valid Absolute Uri.",
    "instance": "/extension/proxy",
    "serviceRequestId": "3572fbb2-4cc2-4e54-9a07-4c87363596a4",
    "exceptionSource": "InvalidProxyExecuteRequestException"
  }
}

What I've Tried

encodeUriComponent() - Error goes away but waypoints aren't recognized correctly

Manual encoding - Replaced "|" with %7C, same result as above

Environment testing - Works fine in development environment, only fails in sandbox (haven't tested in production yet)

Questions

Why does this only happen in sandbox environment but not development?

Has anyone experienced this in production environments as well?

What's the correct way to handle pipe characters in Power Automate HTTP requests for Google Maps API?

Is there a workaround that preserves the waypoint functionality while avoiding the proxy error?

Any help would be greatly appreciated!

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stampcoin 4,082 Super User 2025 Season 2 on at

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Power Automate + Google Maps API: Pipe Character "|" Causing Proxy Error in Sandbox Environment

@CU09061328-0 Hi,

Have you tried to generate the full URI without any compose?

If possible, compose output of the 'ms-plex-targetServiceUrl' from the header.

This is a link which discussed similar problem . ( maybe not, since don't know the value from the proxy).

Proxy double-encodes the URI path even if it is already %-encoded

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