pass QueryString Paramaters from API Gateway to AWS Lambda c#

Question

i am trying to call AWS Lambda using APIGateway and it returns HTML Code. it works fine when i dont pass any parameters, but i want to pass some QueryString parameters and use them in Lambda. i have my Lambda in C# and i see parameters being passed from API

response from API"headers": {}, "QueryStringParameters": { "Environment": "xzc" }, "PathParameters": {} }

In Lambda, the APIGatewayProxyRequest is coming as null API Lambdapublic string FunctionHandler(APIGatewayProxyRequest request, ILambdaContext context)

how do i read the querystring parameters in AWS Lambda in C#

Have you looked at this similar question? stackoverflow.com/questions/41283289/… — bejos-aws
– bejos-aws, Commented Jun 13, 2017 at 0:02

Zbigniew Ledwoń · Accepted Answer · 2019-03-04 09:17:51Z

2

Looks like you just need to check Use Lambda Proxy integration in Integration Request in your API Gateway resource config.

also

you should include:

using Amazon.Lambda.APIGatewayEvents;

and your handler function header should like something like this:

public APIGatewayProxyResponse FunctionHandler( APIGatewayProxyRequest input, ILambdaContext context)

then you can access your query string parameters with:

input.QueryStringParameters

edited Mar 4, 2019 at 9:17

answered Sep 7, 2018 at 13:05

Zbigniew Ledwoń

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Comments

Anugrah A · Accepted Answer · 2017-09-22 20:51:39Z

1

Explaining for more than 1 input parameters as sometimes that is also a problem to developers:

Step 01: This should be your C-Sharp method

public string FunctionHandler(string strEnvironmentA, string strEnvironmentB, ILambdaContext context);

Step 02: In API > GET Method Execution > Method Request add query string parameter for

strEnvironmentA
strEnvironmentB

Step 03: In API > GET Method Execution > Integration Request > Body Mapping Template add this application/json template

"$input.params('strEnvironmentA')" 
"$input.params('strEnvironmentB')"

edited Sep 22, 2017 at 20:51

answered Sep 22, 2017 at 20:42

Anugrah A

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Comments

Farhad · Accepted Answer · 2017-09-21 18:04:27Z

0

Do something like this:

public string FunctionHandler(string input, ILambdaContext context);

And then you can pass the input in the request body instead of query string params.

edited Sep 21, 2017 at 18:04

Farhad

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answered Jul 12, 2017 at 6:26

Safu

1

Comments

Komal12 · Accepted Answer · 2017-08-29 09:51:25Z

-1

if (request.QueryStringParameters != null)
{
    queryStringParameters = request.QueryStringParameters;
    foreach (var item in queryStringParameters)
    {
        Console.WriteLine($"QueryStringParameter - " + item.Key + ":" + item.Value);
    }
}

edited Aug 29, 2017 at 9:51

Komal12

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answered Aug 29, 2017 at 7:30

MattKind

1

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