Path parameter is decoded within the SpringBootLambdaContainerHandler proxy method before it reaches Application's Rest controllers

[jjuncho]

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Serverless Java Container version: 1.9.2

Implementations: Spring Boot

Framework version: SpringBoot 2.7.14

Frontend service: REST API

Deployment method: Serverless Framework

Scenario

Describe what you are trying to accomplish
When we make an api call to the java lambda, we expect the path to be passed in through the handler as is to reach my springboot application's rest controller, extract whatever path parameters are configured and service the request

Expected behavior

Describe how you would expect the application to behave
We expect the SpringBootLambdaContainerHandler to pass the path as is to the application's rest controller to process and perform business as usual functionality

Actual behavior

Describe what you are seeing instead

When we pass a path with an encoded value through the handler method, it will decode the entire path including the encoded value before passing it into my application's rest controller. My application then gives me an internal server error because the encoded value is now decoded when passed to the rest controller, and because the value has a slash in it, the path variable mapping will break.

Steps to reproduce

Unable to provide code sample/logs due to nature of enterprise work

Full log output

Paste the full log output from the Lambda function's CloudWatch logs

logs

[mbfreder]

Hi. Thanks for raising the issue. We are taking a look.

[mbfreder]

Hi @jjuncho. Could you provide an example of a path with an encoded value? We use the Jackson library to deserialize the Json from the input stream into a request class. The decoding is just part of that process.

[mbfreder]

I managed to reproduce the issue. Trying to find the root cause.

[jjuncho]

@mbfreder any updates?

[mbfreder]

@jjuncho Not yet. I'm actively working on it. One question: Is /path?query=%25encoded%24 a good example path to reproduce the issue? That's what I used, I just want to make sure.

[jjuncho]

That works too, I was using more of a /path/%25encoded%25/smth usecase

[mbfreder]

@jjuncho I found what the issue is and I'm working to solve it. But first I would like to confirm the behavior you're looking to get. Do you expect /path/%25encoded%25/smth to reach your controller exactly as-is, or do you want the %25 parts to be decoded (/path/%encoded%/something? Please let me know

[mbfreder]

@jjuncho After more research, it turns out that the path comes already decoded by APIGateway, so it's out of our control. We also found that the query string parameters are passed as-is, so maybe as a workaround you could use that instead of the path parameters.