Amazon API Gateway helps developers create and manage APIs to connect backend systems like EC2 and Lambda to mobile, web, and server applications. An API in API Gateway consists of resources and methods. Resources represent logical entities that can be accessed via HTTP verbs like GET and POST. Methods map API requests to integrations with backend systems. API Gateway handles request/response mapping and provides benefits like monitoring, security controls, and scalability without servers. Pricing is based on monthly API calls and data transfer. Caching can reduce costs for frequently requested data.

1. AWS API
GATEWAY
D E C E M B E R 1 5 , 2 0 1 6
M U H A M M E D YA L Ç I N

2. CONTENT
• WHAT IS API GATEWAY?
• BENEFITS
• RESOURCES AND METHODS
• CREATE NEW API
• CREATE RESOURCE
• CREATE METHOD
• DEPLOY API
• PRICING « US WEST (OREGON) »

3. WHAT IS API GATEWAY?
• Amazon API Gateway helps developers to create and manage APIs to back-end
systems running on Amazon EC2, AWS Lambda or any pubicly addressable web
service.
• With Amazon API Gateway, you can generate custom client SDKs for your APIs, to
connect your back-end systems to mobile, web and server applications or services.
• The API you create in API Gateway consists of a set of resources and methods.

4. BENEFITS
• Low-cost and efficient
• Performance at any scale
• Easily monitor API Activity
• Streamline API Development
• Flexible Security Controls
• Create RESTful Endpoints for Existing Services
• Run Your APIs Without Servers

5. RESOURCES AND METHODS
• A resource is a logical entity that can be accessed through a resource path using the API.
• A resource can have one or more operations that are defined by appropriate HTTP verbs such as GET,
POST, and DELETE.
• A combination of a resource path and an operation identify a method in the API.
• Each method corresponds to a REST API request submitted by the user of your API and the
corresponding response returned to the user.
• API Gateway integrates the method with a targeted back end by mapping the method request to an
integration request acceptable by the back end and then mapping the integration response from the
back end to the method response returned to the user.
• As an API developer, you can configure how methods are mapped to integrations and vice versa by
stipulating what parameters to use and specifying mapping templates to transform payloads of given
data models.

6. CREATE NEW API

7. CREATE RESOURCE
• Resources in API Gateway is a API controller mechanism.
• Click Actions and select Create Resource.

8. CREATE METHOD
• Click Actions and select Create Method.

9. CON’T
• Methods can be GET, DELETE, UPDATE, POST
etc.
• Select an integration type. We will choose
Lambda Function.
• Select a lambda region. (us-west-2 etc.)
• Enter an existing lambda function from auto-
complete textbox.

10. CON’T

11. CON’T
• Click Integration Request. Click Body Mapping Templates. Add mapping templates.
GET method can have a parameters like a query string. Besides POST requests send
data from body part likewise.
• GET POST

12. DEPLOY API
• Click Action and select Deploy API. Click [New Stage]. Deploy new stage.

13. CON’T
• You can see get user url. Go and run it.

14. PRICING « US WEST (OREGON) »
• API Calls
– $3.50 per million API calls received, plus the cost of data transfer out, in gigabytes.
• Data Transfer Costs
– $0.09/GB for the first 10 TB
– $0.085/GB for the next 40 TB
– $0.07/GB for the next 100 TB
– $0.05/GB for the next 350 TB

15. CON’T
• Caching

16. CON’T
• Pricing Example:
– An API that receives five million API calls per month, with each API call returning
responses of 3 kilobytes (KB) in size with no caching.
– Example below reflects pricing for US East, US West, EU (Ireland)
Amazon API Gateway API call charges 5 million * $3.50/million = $17.50
Total size of data transfers 3 KB * 5 million= 15 million/KB = 14.3 GB
Amazon API Gateway data transfer
charges
14.3 GB * $0.09 = $1.29
Total Amazon API Gateway charges $17.50 + $1.29 = $18.79

17. CON’T
• Pricing Example with Caching Required (US East, US West, EU (Ireland))
– If your API needs 1.5 GB of cache for its data, you can provision a 1.6 GB cache at $0.038/hr.
– $0.038 * 24 = $0.912/day

18. REFERENCES
• https://aws.amazon.com/api-gateway/
• https://aws.amazon.com/api-gateway/pricing/
• http://docs.aws.amazon.com/apigateway/latest/developerguide/welcome.html
• https://aws.amazon.com/blogs/aws/amazon-api-gateway-build-and-run-scalable-
application-backends/