how to add headers in the httpresponse trigger

Question

I have created the azure function and the app is successfully registered, add authentication to the function app. Now if hit the URL using postman I have the option of passing a token before hitting the URL. But want I want to do is automate the authentication part from code that gets token and verifies it. Sharing my code below.

def authenticate_client_key():
    authority_host_uri = 'https://login.microsoftonline.com'
    tenant = '<tenantid>'
    authority_uri = authority_host_uri + '/' + tenant
    resource_uri = 'https://management.core.windows.net/'
    client_id = '<clientid'
    client_secret = '<clientsecret>'
    context = adal.AuthenticationContext(authority_uri, api_version=None)
    mgmt_token = context.acquire_token_with_client_credentials(resource_uri, client_id, client_secret)
    credentials = AADTokenCredentials(mgmt_token, client_id)
    return credentials

here credentials is of type dict, from which I create a header - {"Authorization":"Bearer {}".format(bearer_token)}.
this header needs to added to the req object in the main method of function app.

def main(req: func.HttpRequest) -> func.HttpResponse:
    logging.info('Python HTTP trigger function processed a request.')

inside this req object

• I tried adding req.update(headers=credentials) but failed

Answer 1

In a client application, the dictionary you've mentioned would be correct. For example, if you are using the requests package, code like this would be what you need

   requests.post(url, data = dataobj, headers = {"Authorization":"Bearer {}".format(bearer_token)})  

In your Azure Function, the req (instance of HttpRequest) object has a headers property to access a header value, like below

   req.headers.get('authorization')  

You can read more about the HTTP Binding in Python here.