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Parameters in Power Automate Desktop HTTP Post request

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Posted on by Steventran0502

I'm trying to pass parameters into my HTTP POST request to a web API.

Using postman, I can easily set the parameter "batchDate" to be something like "2021-03-21T22:04:55.8299681-10:00". But i can't find how to do that in Power Automate Desktop.

I've tried passing into the headers: {batchDate:"2021-03-21T22:04:55.8299681-10:00"} or {"batchDate":"2021-03-21T22:04:55.8299681-10:00"} but i keep getting error message: "Failed to invoke web service: Specified value has invalid HTTP Header characters. Parameter name: name."

Can someone help me out?

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fraenK 2,125 on at

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If you have one header only, then following works, otherwise create a list variable:
batchDate:2021-03-21T22:04:55.8299681-10:00
key:value

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Steventran0502 20 on at

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I tried that but didn't work. Getting error: No HTTP resource was found that matches the request URI ...
I do notice because it's a date time string, there's colon in the middle so there're multiple colons instead of 2. even if i omit the time portion, it's still giving me the same error.

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fraenK 2,125 on at

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The error indicates that there is something wrong with the URL. Why is it plain http?

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Steventran0502 20 on at

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Its an internally developed api. Its not the issue with the link because im able to do Python,curl or Postman just fine. Just cant do it in Power Automate.
Can you give an example of how you do it in a list? A list only have values so how do you specify key and value pairs?

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fraenK 2,125 on at

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Try this test site and send a request with your header, works fine for me https://hookbin.com/

For a list, just create a new list and add the header key:value pair as a new item. It's basically just a cell per header row

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Steventran0502 20 on at

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Hi Fraenk,

Thanks for your help by providing me the tool for unit test. I was able to make it work. It turns out the API is looking for the parameter in the link, not the header. i'm good with this one.

Next thing I have to find out is how to attach text file to the request. HOpefully I can figure that out too, then my project will be completed!

Much appreciate!

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fraenK 2,125 on at

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Here is a similar example: https://willpagenz.wordpress.com/2019/12/20/using-the-http-action-to-post-multipart-form-data-in-power-automate-logic-apps/

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shoulei 2 on at

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How to fill in if the header has multiple parameters

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TheRealNerfHerd 4 on at

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@shoulei the "Create new list" variable then the "add item to list" variables as many times as needed per header to pass in the syntax @fraenK worked on the SEC's API - but now i gotta figure out why only gibberish came out ay dios mio

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TheRealNerfHerd 4 on at

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figured it out - PEBKAC - Problem Encountered Between Keyboard And Chair - https://www.sec.gov/edgar/sec-api-documentation for all you Finance Sleuths out there

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