[FIXED] How to read query parameter with ^ in the URL

Issue

I'm trying to implement a callback endpoint for eBay. This endpoint is called by eBay to hand the application a user token.

I can define my endpoint as expected

http://localhost:8080/api/ebay/auth

Nothing unusual here. My enpoint looks like this, really basic:

@RestController
@RequestMapping(path = ["/api/ebay/auth"])
class EbayAuthController {

    @GetMapping(path = [""])
    fun getAccessToken(@RequestParam code: String) {
        println("Auth code: $code")
    }

}

Now eBay passes the parameter code with the value

?code=v^1.1%23i^1%23r^1%23p^3%23I^3%23f^0%23t^[excluded_user_token]&expires_in=299

When I call my endpoint with this data set, it returns 400 Bad Request. I can reproduce this by adding ^ to any request. I read it's an unsafe character to use - but the issue is: Ebay uses this character to return the user token, so I must read it.

When I pass a sample with http://localhost:8080/api/ebay/auth?code=123 it prints the code as expected.

I've never encountered that problem, can anyone help me or point me in the right direction how to solve this?

Solution

According to this answer by Dirk Deyne to the question Spring-boot controller error when url contains braces character, you can specify server.tomcat.relaxed-query-chars in your application.properties:

server.tomcat.relaxed-query-chars=^

Answered By - knittl
Answer Checked By - David Marino (JavaFixing Volunteer)