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Rookie1
Frequent Visitor

HTTP command not performing as expected - compared with curl

 I have the following curl command:  (changed some of the id chars at the end)

curl --location 'http://openapi.tuyaeu.com/v1.0/devices/bf83fd230c6a16d19fv0xx/commands' \
--header 'client_id: 5yucsmrw8rtmkpxh5mxx' \
--header 'access_token: 0b81227ee0cff5c53343d15983dced4f' \
--header 'sign: 22CA58C6D6FD0EF69C475EC382A71AA90C29772052D70981C682C64315372F22' \
--header 't: 1712667883918' \
--header 'sign_method: HMAC-SHA256' \
--header 'Content-Type: application/json' \
--data '{
"commands":[
{
"code": "switch_1",
"value":true
}
]
}'

 

 

 

I built this into HTTP:

 

Rookie1_0-1712727437083.png

 

cURL give me expected response while HTTP says sign invalid.

 

 

I checked about 100 times and think I have all the lettering correct.

I executed curl command and also tested this with Postman - all working, except HTTP.

 

Is there anyway that I can debug and see what HTTP is actually requesting to help me debug?

 

 

4 REPLIES 4
Rookie1
Frequent Visitor

I found the problem, but does not have the solution. The problem is that the sign is calculated from many of the contents of the total query,

The body is critical. In the curl it is built from tabs to create the json and in powerapps spaces are used.  This makes the curl string 89 characters vs 109 characters in powerapps. Therefore signature fails.

 

I tried to compress the json string in both cases without any spaces or tabs, but the spaces are automatically inserted when I publish the HTTP flow.

 

Interesting problem, but I do not have a solution. I will appreciate any idea.

choongseng
New Member

I'm not sure if you intend to have the calculation of the signature hash (your sign) done by the caller or to be in your custom connector. I think if it is supposed to be calculated by the custom connector, then you could make use of the custom code section to write some code to recalculate that and replace your request header.

 

Check this page for the custom code support in custom connector:

https://learn.microsoft.com/en-us/connectors/custom-connectors/write-code

 

Thanks for the answer. I have a large part already as custom code, but working with Postman, I tried to bypass some c# matrix code where the coding is done and just pass the result. I copied and pasted the code and let postman do the calculation (it is the same for all and I end up with a string for on and a string for off) No matter what I do, the payload remains 89 characters in postman, which means they strip everything off when doing the call.

 

I guess my outcome should be to do more coding in c#, just not sure if that will give the correct result. Bottom line is when I switch custom connector to raw mode and paste in the body from postman, it works and shows as 89 characters. Maybe I should design body as empty and send a raw string from powerapps/powerautomate?

 

I am a bit stumped at this stage. 

I found this as a solution to my problem :

https://powerusers.microsoft.com/t5/Building-Power-Apps/How-to-call-a-custom-connector-from-powerapp.... This works great. I just wich I could do this from powerautomate.

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