# REST API system.net.httpClient() - Post Errors 415, 400

**URL:** <https://forum.inductiveautomation.com/t/rest-api-system-net-httpclient-post-errors-415-400/76744>\
**Category:** Ignition\
**Tags:** ignition81, perspective\
**Created:** [July 22, 2023, 5:32pm UTC](https://forum.inductiveautomation.com/t/rest-api-system-net-httpclient-post-errors-415-400/76744 "2023-07-22T17:32:34Z")\
**Posts on this page:** 1\
**Showing post:** 2

<div class="post-metadata">

**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\
**Post date:** [July 22, 2023, 6:03pm UTC](https://forum.inductiveautomation.com/t/rest-api-system-net-httpclient-post-errors-415-400/76744/2 "2023-07-22T18:03:35Z")

</div>

> [@r123](#):
>
> The working Post in Postman shows a lot more request headers and so on but I'm not sure what else the Ignition post function requires to work.

The Ignition side doesn't require anything. It's a question of what the server requires...

Try using a named parameter when you pass `TagList`. I'm worried you're passing it as `params` rather than `data` right now. e.g.

```auto
Response = client.post(url, data=TagList, username="admin", password="!%^$!")

```

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