Angular 4 HTTP custom headers

Question

In service:

let headers = new HttpHeaders();
     headers = headers.append('sessionToken', token);

in request:

{"normalizedNames":{},"lazyUpdate":[{"name":"sessionToken","value":"22ddc387-dfab-4e03-bbf9-241d75968133","op":"a"}],"headers":{},"lazyInit":{"normalizedNames":{},"lazyUpdate":null,"headers":{}}}

server response:

There are no «sessiontoken» in CORS «Access-Control-Allow-Headers»

Why doesn't it add "sessiontoken" into headers?

user4676340 · Accepted Answer · 2018-04-16 14:05:13Z

1

Because as said in the error,

There are no «sessiontoken» in CORS «Access-Control-Allow-Headers»

Your server must return a response with the header

Access-Control-Allow-Headers = "sessionToken"

answered Apr 16, 2018 at 14:05

user4676340

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4 Comments

Serhio g. Lazin Over a year ago

but parameter added into 'lazyUpdate'? headers are empty

user4676340 Over a year ago

No, in your server configuration, the same way you added your CORS headers.

Serhio g. Lazin Over a year ago

Can you please provide an example?

user4676340 Over a year ago

No I can't. This isn't an Angular issue, that's a server issue. First of all, you should state what back-end you're using, then rephrase your question to ask how to add CORs headers to your server.

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