When I deploy my project on the test site it is impossible to retrieve data from the API. Locally the problem does not arise.

api.siren.service.ts:29 Erreur API détectée: 
HttpErrorResponse {headers: _HttpHeaders, status: 200, statusText: 'OK', url: '::8000/xxxx/', ok: false, …}
(anonymous)    @    api.siren.service.ts:29
Zone - XMLHttpRequest.addEventListener:load
searchSiret    @    headerponent.ts:1122
HeaderComponent_div_55_div_17_Template_button_click_2_listener    @    headerponent.html:548
Zone - HTMLButtonElement.addEventListener:click
HeaderComponent_div_55_div_17_Template    @    headerponent.html:548
HeaderComponent_div_55_Template @  headerponent.html:543
Zone - Promise.then
(anonymous)    @    main.ts:5

headerponent.ts:1132 Erreur API SIREN: Error: Erreur API (HTTP 200): Http failure during parsing for :8000/xxx/
    at api.siren.service.ts:39:37
    at _Observable.init [as _subscribe] (throwError.js:5:51)
    at _Observable._trySubscribe (Observable.js:37:25)
    at Observable.js:31:30
    at errorContext (errorContext.js:19:9)
    at _Observable.subscribe (Observable.js:22:9)
    at catchError.js:14:31
    at OperatorSubscriber._error (OperatorSubscriber.js:23:21)
    at OperatorSubscriber.error (Subscriber.js:40:18)
    at OperatorSubscriber._error (Subscriber.js:64:30)

{
  "/api-sirene/": {
    "target": ";,
    "secure": true,
    "changeOrigin": true,
    "logLevel": "debug",
   "pathRewrite": {
      "^/api-sirene": "/api-sirene/3.11/siren"
    }
  }
}

I thought I needed the SSL certificate, but even with that nothing changed. I think the problem may be with the proxy configuration. I thank you in advance for your help.