[Sentry] Fail to Create a New Project via REST API

Problem
I am using spring boot to implement web application, and trying to use sentry's rest API to create a new sentry project. I get this exception as I use rest API:

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org.springframework.web.client.HttpClientErrorException: 403 OK at org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:91) ~[spring-web-4.3.2.RELEASE.jar:4.3.2.RELEASE] at org.springframework.web.client.RestTemplate.handleResponse(RestTemplate.java:667) ~[spring-web-4.3.2.RELEASE.jar:4.3.2.RELEASE] at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:620) ~[spring-web-4.3.2.RELEASE.jar:4.3.2.RELEASE] at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:580) ~[spring-web-4.3.2.RELEASE.jar:4.3.2.RELEASE]

I try to use Advanced REST Client to do test, it succeed. Why?



How-To
Owing this http request is triggered at server side, so we cannot use browser's developer tool to debug.

You can go to telerik to download fiddler to help us to do web debug and to figure out what's the response it returns to us.

Fiddler is a free web debugging proxy which logs all HTTP(s) traffic between your computer and the Internet. Use it to debug traffic from virtually any application that supports a proxy like IE, Chrome, Safari, Firefox, Opera and more.
Before using fiddler, you need to set proxy to spring boot to send web traffic to Fiddler.

You can see all requests in fiddler, it looks like:



We also see the bad request, and find out the problem results from the rest URL had unnecessary blank (%20)


The response looks like (sentry tell it violate CSRF problem, but the real problem is the wrong REST URL):



Reference
[1] https://docs.sentry.io/hosted/api/teams/post-team-project-index/