# URL rejection due to port number issue.

**Category:** [Open Forum](https://forum.rcpch.tech/c/general/4)
**Created:** 2025-11-05 13:54 UTC
**Views:** 8
**Replies:** 3
**URL:** https://forum.rcpch.tech/t/url-rejection-due-to-port-number-issue/620

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## Post #1 by @wmcdevitt

Hello,

I get the following error when  trying to access digital growth charts. Can anyone help?

C:\\Users\\will\_>curl --location --request POST ‘https://api.rcpch.ac.uk/growth/v1/uk-who/calculation’
curl: (3) URL rejected: Port number was not a decimal number between 0 and 65535

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## Post #2 by @michael.barton

Thanks @wmcdevitt. It looks like this is an issue with single quotes on the windows command line.

If you'd like to use Powershell something like this should work:

```powershell
$body = @{
    "birth_date" = "2020-04-12"
    "observation_date" = "2028-06-12"
    "observation_value" = 115
    "sex" = "female"
    "gestation_weeks" = 40
    "gestation_days" = 0
    "measurement_method" = "height"   
} | ConvertTo-Json


Invoke-RestMethod -Uri 'https://api.rcpch.ac.uk/growth/v1/uk-who/calculation' -Method Post -Body $body -Headers @{
    'Subscription-Key' = 'YOUR_PRIMARY_API_KEY_GOES_HERE'
    'Content-Type' = 'application/json'
}
```

You can also use [WSL](https://learn.microsoft.com/en-us/windows/wsl/install) to install a Linux system on your Windows machine which will let you use the example as is.

I've raised [Example curl command doesn't work on Windows · Issue #138 · rcpch/digital-growth-charts-documentation](https://github.com/rcpch/digital-growth-charts-documentation/issues/138) to update our documentation to cover this.

Which system/programming language are you ultimately aiming to consume the API response from?

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## Post #3 by @pacharanero

[quote="michael.barton, post:2, topic:620"]
If you’d like to use Powershell something like this should work:
[/quote]

If someone with a Windows machine can confirm that this Powershell example works on Windows then I will add it to the docs site.

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## Post #4 by @wmcdevitt

Hello,

Thanks for helping with this.

I can confirm it works in Powershell

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**Canonical:** https://forum.rcpch.tech/t/url-rejection-due-to-port-number-issue/620
**Original content:** https://forum.rcpch.tech/t/url-rejection-due-to-port-number-issue/620