salesforce api integration through Alamofire? - swift

While integrating for auth api through Alamofire, it gives error.
http://test.salesforce.com/services/oauth2/token
Optional(["Content-Type": "application/x-www-form-urlencoded"])
Param: client_id=3MVG9e2mBbZnmM6lFmND2Ju7xFYp.iaixYWQ7tuDZKWs4Jqs9pxjm3kenjwAqhG28yWavIReD9wkchzFaBcMO&client_secret=8967652660758155787&grant_type=password&password=qwerty%4012&username=xxxx%40yahoo.com
Response:
error = "unsupported_grant_type";
"error_description" = "grant type not supported";
I am getting response through POSTMAN so Is there something I am missing?

Salesforce doesn't support JSON in the access token request; the OAuth 2.0 spec mandates application/x-www-form-urlencoded.

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Edit
i've tried like following with postman
Put
https://[api]/v2/apps/211c82e2-7316-45b6-9ae6-1df4dzz74772/stop
Header
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"Content-Type":"application/x-www-form-urlencoded"
I got error:
{
"description": "Unknown request",
"error_code": "CF-NotFound",
"code": 10000
}
Any idea?
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I have tried using the /requests endpoint with my Uber developer account's owner and developer accounts, but I get this error:
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{
"message": "This endpoint requires at least one of the following scopes: request.delegate.tos_accept, request, request.delegate", "code": "unauthorized"
}
My HTTP call is as follows:
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Headers:
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Accept-Language: en_US
Content-Type: application/json
Parameters:
{"start_latitude":"21.1741125","start_longitude":"72.8121804","end_latitude":"21.2048986","end_longitude":"72.8386455"}
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