SPA / Angular will forcefully set browser url

Let me know what tech you're using (React, Vue, etc.) — I can give you an exact code fix.

You said:

if same angular spa mapped into two different directory it will use second directory as url

ChatGPT said:

Yes — if you serve the same Angular SPA from two different URLs (e.g., /folder1 and /folder2), and both are mapped to the same physical files, then:

✅ Angular will use the URL you loaded the app from as its base

So if you open:

bash
http://localhost:8080/folder2

Then Angular will (by default) treat /folder2 as the app's root — not /folder1.

 So here’s what controls Angular’s behavior:

1. <base href="..."> in index.html

This is injected during build. By default, Angular uses:

html
<base href="/">

But if you built it like:

bash
ng build --base-href /folder1/

Then the output will contain:

html
<base href="/folder1/">

And now if you serve that same app at /folder2, Angular will say:

“Whoa — I’m at /folder2, but I think I belong in /folder1,” and it'll start rewriting URLs or routing weirdly.

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🧼 Fix: Use relative base href or match it dynamically

✅ Option 1: Build once per mount path (cleanest)

If you want to serve Angular at both /folder1 and /folder2, the most correct approach is to build two versions:

bash
ng build --base-href /folder1/ --output-path dist/folder1
ng build --base-href /folder2/ --output-path dist/folder2

Then serve dist/folder1 at /folder1 and dist/folder2 at /folder2

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✅ Option 2: Use relative base href (experimental)

In index.html:

html
<base href="./">

This makes Angular use the current path (more flexible), but it can break lazy loading or deep routing depending on your setup.