Only first rule is taken into account in proxy configuration

[VictorienTardif]

🐞 Bug report

What modules are related to this issue?

• aspnetcore-engine
• builders
• common
• express-engine
• hapi-engine

Is this a regression?

I don't know.

Description

When you have several rules in your proxy configuration file only the first one is taken, following are ignored.

🔬 Minimal Reproduction

1. Create a proxy.conf.json file with 2 rules

{
  "/api1": {
    "target": "http://www.api1.com",
    "pathRewrite": {
      "^/api1": "/"
    },
    "secure": false
  },
  "/api2": {
    "target": "http://www.api2.com",
    "pathRewrite": {
      "^/api2": "/"
    },
    "secure": false
  }
}

2. Add the proxyConfig option in angular.json

"serve-ssr": {
       "builder": "@nguniversal/builders:ssr-dev-server",
        ...
       "options": {
         "proxyConfig": "proxy.conf.json"
       }
},

3. Run the Angular Universal Live Development Server

Only the first rule is taken into account:

Compiled successfully.
[HPM] Proxy created: /api1 -> http://www.api1.com
[HPM] Proxy rewrite rule created: "^/api1" ~> "/"
** Angular Universal Live Development Server is listening on http://localhost:4200, open your browser on http://localhost:4200 **

🌍 Your Environment

Angular CLI: 12.2.4
Node: 14.15.0
Package Manager: yarn 1.22.11
OS: darwin x64

Angular: 12.2.4
... animations, cli, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... platform-server, router, service-worker

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1202.8
@angular-devkit/build-angular   12.2.4
@angular-devkit/core            12.2.4
@angular-devkit/schematics      12.2.4
@angular/cdk                    12.2.6
@angular/fire                   7.0.4
@angular/flex-layout            12.0.0-beta.35
@nguniversal/builders           12.1.2
@nguniversal/express-engine     12.1.2
@schematics/angular             12.2.4
rxjs                            6.6.7
typescript                      4.3.5

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