NWS Connector Policy Template

Correct Answer: C

A custom connector is an API wrapper around the REST API.

When you develop your application using REST API services, you need to describe the API's operations before exporting your APIs.

There are three approaches to how to create the API definitions: Using a blank custom connector.

Using an Open API definition.

Using a Postman Collection.

Then you need to secure your Web APIs and set the authentication type for your custom connector.

In the end, when you test a new custom connector, you can use it in Power Apps, Power Automate, and Azure Logic Apps.

If you need to change the connector's behavior during the run time, like to route a call to a different endpoint, the custom connector's Policies (Number 1) help you define the URL templates of your dynamic URL.

One of the Policy templates is the "Set Host URL" (Number 2)

This template replaces the host URL with the URL generated from the "URL Template" expression (Number 3).

The URL template expression for the NWS looks like:

https://api.weather.gov/gridpoints/@connectionParameters(`nwsoffice`)/@connectionParameters(`gridX`),@connectionParameters(`gridY`)/forecast

where the nwsoffice, gridX, and gridY are the path parameters.

You can define these parameters in the Request section of the Definition stage (Number 1).

All other options are examples of the Policy templates.

They are irrelevant to the current task.

For more information about custom connector's Policy templates, please visit the below URLs:

Sure, I can explain the different Policy templates and help you select the appropriate one for the NWS connector.

API Management policies are a set of tools that enable you to apply custom logic to API requests and responses. They allow you to customize your API by modifying the headers, body, or URL parameters of incoming requests or outgoing responses. There are several types of policies available in Azure API Management, including those mentioned in the question:

A. Set HTTP header - This policy allows you to add, remove, or modify an HTTP header in a request or response message. You can use this policy to set the HTTP header for the NWS connector if required.

B. Set property - This policy allows you to set a property value that can be accessed later in the policy. This can be useful if you want to reuse the same value in multiple policies.

C. Set Host URL - This policy allows you to change the destination URL for an API request. You can use this policy to modify the URL of the NWS connector if required.

D. Set query string parameter - This policy allows you to add or modify a query string parameter in an API request. You can use this policy to set the query string parameter for the NWS connector if required.

E. Set header/query parameter value from URL - This policy allows you to extract a value from the URL of an API request and use it to set the value of a header or query parameter. You can use this policy to extract the grid points or coordinates values from the URL and use them to set the appropriate query string parameter values for the NWS connector.

In this case, the NWS provides two types of forecasts: by grid points and by coordinates. Therefore, you need to define the Policy details for the NWS connector accordingly.

Based on the information provided, it seems like the appropriate policy template for the NWS connector would be D. Set query string parameter, as you would need to set the query string parameters to retrieve the correct forecast. However, depending on the specific requirements of your use case, you may also need to use other policy templates. For example, if you need to authenticate the API requests, you would need to use policies like Set HTTP header or Set property to set the necessary authentication tokens or credentials.

I hope this explanation helps you understand the different policy templates and select the appropriate one for the NWS connector.