Canceling an in-progress JSONP request causes "callback undefined" console error #34818
Description
🐞 bug report
Affected Package
@angular/common/http
Is this a regression?
No
Description
It looks like HttpClientJsonpModule deletes the JSONP callback function for a request immediately upon cancellation. If the request was still in progress, an error is logged in the console when it completes because the function doesn't exist.
This issue occurs when the time between requests is usually lower than the time a request takes to complete.
🔬 Minimal Reproduction
https://angular-c6oeqi.stackblitz.io
https://stackblitz.com/edit/angular-c6oeqi
🔥 Exception or Error
Uncaught ReferenceError: ng_jsonp_callback_16 is not defined
🌍 Your Environment
Can be reproduced with Angular 8 (see repro)
Angular CLI: 6.2.9
Node: 8.17.0
OS: darwin x64
Angular: 6.1.10
... animations, common, compiler, compiler-cli, core, forms
... http, platform-browser, platform-browser-dynamic
... platform-server, router
Package Version
-----------------------------------------------------------
@angular-devkit/architect 0.8.9
@angular-devkit/build-angular 0.8.9
@angular-devkit/build-optimizer 0.8.9
@angular-devkit/build-webpack 0.8.9
@angular-devkit/core 0.8.9
@angular-devkit/schematics 0.8.9
@angular/cdk 6.4.7
@angular/cli 6.2.9
@angular/language-service 7.2.15
@ngtools/webpack 6.2.9
@schematics/angular 0.8.9
@schematics/update 0.8.9
rxjs 6.2.2
typescript 2.9.2
webpack 4.16.4
Anything else relevant?
No