A large e-commerce furniture company is using a Web application supported by Application Load Balancer.
ALB invokes a Lambda function based upon query parameter key within HTTP headers in the client request.
When clients search products on this application with size & color options, they get responses only on one of the options & not both.
Marketing Team is looking for a quick resolution for this error. Which of the following can be done to resolve this error?
Click on the arrows to vote for the correct answer
A. B. C. D.Correct Answer -D.
By default, ALB considers the last value within query parameters while invoking Lambda Function.
In the case of multiple query parameters, Multi-value headers need to be enabled to pass all query parameter values to the Lambda function.
Option A is incorrect as this will consider header parameters in the request & not query string parameters.
Option B is incorrect as Path-based routing will consider URL within the request for forwarding towards Target groups.
Option C is incorrect as Host-based routing will consider the host field with HTTP headers for forwarding requests towards Target groups.
For more information on Lambda Function as the target for ALB, refer to the following URL-
https://docs.aws.amazon.com/elasticloadbalancing/latest/application/lambda-functions.html#multi-value-headersThe issue with the e-commerce furniture company's Web application is that clients are only receiving responses for one of the options (either size or color) when searching for products with both size and color options. This suggests that the Lambda function invoked by the Application Load Balancer is not properly handling the query parameters in the client request.
To resolve this error, we need to modify the way the Application Load Balancer invokes the Lambda function based on the query parameters in the client request. Let's examine each of the possible solutions provided in the answer choices.
A. Enable HTTP header condition for Target groups with Target as Lambda function. This solution suggests that we can use HTTP header conditions to route requests to specific target groups. While this may help with routing requests to the appropriate target group, it doesn't address the issue with the Lambda function not properly handling the query parameters in the client request.
B. Enable Path-based routing for Target groups with Target as Lambda function. Path-based routing allows us to route requests to different target groups based on the path of the request URL. However, this solution doesn't address the issue with the Lambda function not properly handling the query parameters in the client request.
C. Enable Host-based routing for Target groups with Target as Lambda function. Host-based routing allows us to route requests to different target groups based on the host name of the request URL. Similar to path-based routing, this solution doesn't address the issue with the Lambda function not properly handling the query parameters in the client request.
D. Enable Multi-Value headers for Target groups with Target as Lambda function. This solution suggests that we can use multi-value headers to pass multiple values for the same header key in the client request. This would allow the Lambda function to properly handle the query parameters in the client request and return responses for both size and color options.
Therefore, the correct answer is D. Enable Multi-Value headers for Target groups with Target as Lambda function.