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Strict host header validation breaks route extraction #32730
Description
Command
build
Is this a regression?
- Yes, this behavior used to work in the previous version
The previous version in which this bug was not present was
20.3.13
Description
Since an update of @angular/cli from 20.3.13 to 20.3.19, "extracting routes" fails when running ng build. The route extraction procedure boots an Angular app wherein my server.ts file requires certain process.env keys to exist, and otherwise throws an error. These variables used to be inherited from the parent process but no longer are.
I have pinpointed the issue to #32516, where in prerender.ts new keys env are set inside constructor options for WorkerPool, which changes the behavior of lines 33-39 of WorkerPool that now hits the if branch instead of the else branch.
I have confirmed this is the case by changing the blocks in prerender.ts as follows:
env: {
++ ...process.env,
'NG_ALLOWED_HOSTS': 'localhost',
},Is this intended behavior? If so, how do I fix it given that all of this looks to be internal angular builder logic?
Thanks!
Minimal Reproduction
Add a block to server.ts:
if (! process.env.TEST) {
throw new Error('oops');
}run the following command:
TEST=true npx ng build
Exception or Error
✘ [ERROR] An error occurred while extracting routes.
oops
Your Environment
_ _ ____ _ ___
/ \ _ __ __ _ _ _| | __ _ _ __ / ___| | |_ _|
/ △ \ | '_ \ / _` | | | | |/ _` | '__| | | | | | |
/ ___ \| | | | (_| | |_| | | (_| | | | |___| |___ | |
/_/ \_\_| |_|\__, |\__,_|_|\__,_|_| \____|_____|___|
|___/
Angular CLI: 20.3.19
Node: 24.3.0
Package Manager: npm 11.4.2
OS: darwin arm64
Angular: 20.3.17
... animations, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, platform-server
... router
Package Version
---------------------------------------
@angular-devkit/architect 0.2003.19
@angular-devkit/build-angular 20.3.19
@angular-devkit/core 20.3.19
@angular-devkit/schematics 20.3.19
@angular/build 20.3.19
@angular/cdk 20.2.4
@angular/cli 20.3.19
@angular/material 20.2.4
@angular/ssr 20.3.19
@schematics/angular 20.3.19
rxjs 7.8.2
typescript 5.9.2
zone.js 0.15.1
Anything else relevant?
I'm using Angular SSR.
Activity
fix(angular/build): pass process environment variables to prerender w…
fix(angular/build): pass process environment variables to prerender w…
fix(@angular/build): pass process environment variables to prerender …
fix(@angular/build): pass process environment variables to prerender …
fix(@angular/build): pass process environment variables to prerender …
fix(@angular/build): pass process environment variables to prerender …
fix(@angular/build): pass process environment variables to prerender …
fix(@angular/build): pass process environment variables to prerender …
fix(@angular/build): pass process environment variables to prerender …
fix(@angular/build): pass process environment variables to prerender …
angular-automatic-lock-bot commentedon Apr 11, 2026
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