# Upgrading to 1.9.0
# Introduction
The main and the most important change was implementation of the init function for a performance boost and rework of
the token flow logic, which was a necessary step after the usage of the init function.
# Init function
Previously, Apollo Client was created on every request which was not a very good solution in terms of performance.
Utilizing the new core mechanism we implemented the init function to bootstrap the client once on the build time.
| File | What was changed |
|---|---|
| [!] packages/api-client/src/index.server.ts | Move client creation logic from the onCreate to the init function |
For a reference please check getInitConfig (opens new window) in the middleware package.
# Token flow
Due to tokens leaks and security issues after the implementation of the init function, token flow was reworked.
| File | What was changed |
|---|---|
| [!] packages/api-client/src/token/TokenManagerFactory.ts | Creates object with helpers for reading and creating access token cookies and accessing current token provider |
| [!] packages/api-client/src/token/tokenParser.ts | Parses raw token string into an object |
| [!] packages/api-client/src/links/** | All Apollo Client links related factories and handlers |
| [!] packages/api-client/src/links/createLinks.ts | Main entry point for links creation |
# Token Flow Diagrams
