How can I redirect a URL for post request using AWS lambda?

Question

These results are for GET and POST requests response through API gateway and lambda. used same lambda function, but when i used post method of API gateway, response just shows me JSON. what should i have to do?

when i used post req

when i used get req it's my lambda function

exports.handler = (event, context, callback) => {
   const response = {
    statusCode: 301,
    headers: {
      Location: 'https://google.com',
    }
  };

  return callback(null, response);
}

thank you.

Answer 1

I usually use the new async/await pattern when defining my aws lambdas :

exports.handler = async (event) => {
 // do stuff...
}

you usually don't need the context, unless you want to use some aws-related info regarding your lambda. I have a helper function that is re-used a lot inside the code base

function proxyResponse(inBody, inStatusCode = null, headers = {}, event = null) {
  if (!isApiGateway(event)) {
    if (inBody instanceof Error) {
      throw inBody;
    }
    return inBody;
  }
  let statusCode = inStatusCode;

  let body;
  if (inBody instanceof Error) {
    statusCode = statusCode || INTERNAL_SERVER_ERROR;
    body = JSON.stringify({
      message: inBody.message,
      code: statusCode,
    });
  } else if (inBody instanceof Object) {
    body = JSON.stringify(inBody);
  } else {
    body = inBody;
  }

  const [origin] = event ? caseHandler(event.headers, 'origin') : [];

  return {
    statusCode: statusCode || 200,
    body,
    headers: Object.assign({
      'Access-Control-Allow-Headers': 'Content-Type,Authorization,X-Amz-Date,X-Api-Key,X-Amz-Security-Token,x-api-key,Authorization',
      'Access-Control-Allow-Origin': origin,
      'Access-Control-Allow-Credentials': true,
      'Access-Control-Allow-Methods': 'DELETE,GET,HEAD,OPTIONS,PATCH,POST,PUT',
    }, headers),
  };
}

and another one :

function caseHandler(mixedCaseObject, inputKey) {
  if (!mixedCaseObject || !inputKey) {
    return [];
  }
  return Object.keys(mixedCaseObject)
    .filter((key => key.toLowerCase() === inputKey.toLowerCase()))
    .map(key => mixedCaseObject[key]);
}

and this one :

function isApiGateway(event) {
  return (!!event.httpMethod && !!event.headers && !!event.requestContext);
}

so inside the lambda whenever I want to return something I use this helper functions :

module.exports.handler = async (event) => {
  try{
 // do stuff...
 return proxyResponse(YOUR_CUSTOM_BODY_OBJECT, Api.HTTP.OK, {}, event);
 } catch(error) {
 return proxyResponse(error, Api.HTTP.INTERNAL_SERVER_ERROR, {}, event);
 }
}