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Enabling CORS on API Gateway resources
Monday 15, January 2018   |   Post link   |   Sample code  Download related material
Enable CORS Title Image

Posting a small utility which you can include in yours DotNetCore AWS development steps to enable CORS on AWS API Gateway resources.

For DotNetCore lambda development

The serverless.template file is where you define all your resources for the API Gateway. However there is no way to create mock API Gateway requests which is something most of us need to create the OPTIONS method while enabling CORS.

The EnableCORS.dll program allows you to enable OPTIONS method on your API Gateway resources by listing all the required resource paths in a text file and running the dll using .NET Core 1.0.

Sample file contents:

#How to create entires
#path=/roles
#allowed-origins=* or comma-separated list of addresses
#allowed-headers=comma-separated list of headers
#allowed-methods=get,options or just *

path=/posts
allowed-origins=*
allowed-headers=Content-Type,x-requested-with,Access-Control-Allow-Headers,Access-Control-Allow-Origin,Access-Control-Allow-Methods
allowed-methods=get,options

path=/categories
allowed-origins=mydomain.com,myhost.com
allowed-headers=Content-Type,x-requested-with,Access-Control-Allow-Headers,Access-Control-Allow-Origin,Access-Control-Allow-Methods
allowed-methods=*

In the above file I am saying that I want to enable CORS for the /posts and /categories paths in AW API Gateway. Once the paths are define I only need to run the following command:

DotNet EnableCORS -accesskey BAABAABLACKSHEEPFZ5A -secretkey MYSUPERSUPERSECRETKEY -region us-east-1 -apiid myapi5idv5 c:\\deployment\\cors.txt

And thats it! If you are interested in the source code, you can get it at Github .

Hope this post was useful.

Sample code  Download related material


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