Angular2 - Utilizing the "withCredentials" Request Setting

Question

Angular2 - Utilizing the "withCredentials" Request Setting

I encountered a CORS problem while attempting to connect to Neo4j in an Angular2 component:

Response to preflight request doesn't pass access control check. A wildcard '*' cannot be used in the 'Access-Control-Allow-Origin' header when the credentials flag is true. Origin 'http://localhost:8080' is therefore not allowed access. The credentials mode of an XMLHttpRequest is controlled by the withCredentials attribute.

Is there a way to specify withCredentials: false in the request (Typescript)? I believe this could solve the issue. However, the request ts file does not have withCredentials listed in its CoreOptions object. Also, the Neo4j-Typescript package does not include this in its Typescript definition.

neo4j typescript xmlhttprequest angular cors

Answer 1

Answer №1

To achieve this functionality, create a new class that extends the BrowserXhr class:

@Injectable()
export class CustomBrowserXhr extends BrowserXhr {
  constructor() {}
  build(): any {
    let xhr = super.build();
    xhr.withCredentials = false;
    return <any>(xhr);
  }
}

Then, replace the default BrowserXhr provider with your custom implementation:

bootstrap(AppComponent, [
  HTTP_PROVIDERS,
  provide(BrowserXhr, { useClass: CustomBrowserXhr })
]);

Answer 2

To achieve this functionality, create a new class that extends the BrowserXhr class:

@Injectable()
export class CustomBrowserXhr extends BrowserXhr {
  constructor() {}
  build(): any {
    let xhr = super.build();
    xhr.withCredentials = false;
    return <any>(xhr);
  }
}

Then, replace the default BrowserXhr provider with your custom implementation:

bootstrap(AppComponent, [
  HTTP_PROVIDERS,
  provide(BrowserXhr, { useClass: CustomBrowserXhr })
]);

Answer 3

Answer №2

Dealing with a similar issue in my Angular2 project, I discovered the challenge of preflight requests being sent to the server before each client request.

These preflight requests are of type OPTIONS, and it's crucial for the server to respond with a 200 status code and appropriate headers to allow requests from that particular client.

Here is how I resolved this using express:

// Allow requests from specific domain
res.setHeader('Access-Control-Allow-Origin', 'http://localhost:3000');

// Define permitted request methods
res.setHeader('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE');

// Specify allowed request headers
res.setHeader('Access-Control-Allow-Headers', 'YOUR-CUSTOM-HEADERS-HERE');

// Enable sending cookies with requests if needed
res.setHeader('Access-Control-Allow-Credentials', true);

// Handle Preflight Request
if (req.method === 'OPTIONS') {
    res.status(200);
    res.end();
}
else {
    // Proceed to next middleware layer
    next();
}

By setting the headers and checking for the OPTIONS method, I can effectively manage authorization for clients and include custom headers in all requests without CORS concerns.

Answer 4

Dealing with a similar issue in my Angular2 project, I discovered the challenge of preflight requests being sent to the server before each client request.

These preflight requests are of type OPTIONS, and it's crucial for the server to respond with a 200 status code and appropriate headers to allow requests from that particular client.

Here is how I resolved this using express:

// Allow requests from specific domain
res.setHeader('Access-Control-Allow-Origin', 'http://localhost:3000');

// Define permitted request methods
res.setHeader('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE');

// Specify allowed request headers
res.setHeader('Access-Control-Allow-Headers', 'YOUR-CUSTOM-HEADERS-HERE');

// Enable sending cookies with requests if needed
res.setHeader('Access-Control-Allow-Credentials', true);

// Handle Preflight Request
if (req.method === 'OPTIONS') {
    res.status(200);
    res.end();
}
else {
    // Proceed to next middleware layer
    next();
}

By setting the headers and checking for the OPTIONS method, I can effectively manage authorization for clients and include custom headers in all requests without CORS concerns.

Answer 5

Answer №3

To modify the withCredentials, you must create a custom BrowserXhr. Check out this reference for more information: answer.

Answer 6

To modify the withCredentials, you must create a custom BrowserXhr. Check out this reference for more information: answer.

Angular2 - Utilizing the "withCredentials" Request Setting

Answer №1

Answer №2

Answer №3

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