Power Platform Community Forum Thread Details

I keep getting a 502 error when trying to access an Apigee endpoint for an API key using an HTTP request. I have confirmed that the URI is functional and gives an API key when using postman. Below are example attempts for what I have tried to get working.

{
    "uri": "(confirmed working)",
    "method": "POST",
    "headers": {
        "Content-Type": "application/x-www-form-urlencoded"
    },
    "retryPolicy": {
        "type": "None"
    },
    "authentication": {
        "username": "*sanitized*",
        "password": "*sanitized*",
        "type": "Basic"
    },
    "body": "grant_type=client_credentials"
}

and

{
    "uri": "(confirmed working)",
    "method": "POST",
    "headers": {
        "Content-Type": "application/x-www-form-urlencoded"
    },
    "retryPolicy": {
        "type": "None"
    },
    "body": "grant_type=client_credentials&client_id=*sanitized*&client_secret=*sanitized*"
}

and

{
    "uri": "(confirmed working)",
    "method": "POST",
    "headers": {
        "Content-Type": "application/x-www-form-urlencoded"
    },
    "retryPolicy": {
        "type": "None"
    },
    "body": {
        "grant_type": "client_credentials",
        "client_id": "*sanitized*"
        "client_secret": "*sanitized*"
    }
}

The 502 error is always of the form

{
    "statusCode": 502,
    "headers": {
        "Date": "Thu, 12 Feb 2026 15:43:07 GMT",
        "Strict-Transport-Security": "max-age=31536000; includeSubDomains",
        "x-ms-islandgateway": "_prdil108wusgb0_2",
        "x-ms-igw-tracking-id": "405e6747-ee53-4467-950c-f726771115b920260212154307_prdil108wusgb0_2",
        "mise-correlation-id": "2f4134a2-94fd-489b-9833-c23b14408569",
        "Server-Timing": "x-ms-igw-upstream-headers;dur=83.2,x-ms-igw-req-overhead;dur=0.8",
        "X-Content-Type-Options": "nosniff",
        "x-ms-service-request-id": "405e6747-ee53-4467-950c-f726771115b9",
        "x-ms-correlation-id": "7d57183d-eb28-4468-9892-fe9f6eca155e",
        "x-ms-activity-vector": "00.00.IN.05.IN.0I.00",
        "Content-Length": "0"
    }
}

I'm not sure what the issue is or how to go about attempting to fix it, the rest of the process is built up in power automate and I need to use it.

Categories:

Building flows