How to remove Content Type set in HTTP Interceptors for uploading a file in angular4

Question

In my application we set content-type = application/json in interceptor. But to upload a file content-type should be multipart/form-data ,i.e it will take contant-type = multipart/form-data when we try to upload form data. my question is how can I remove the content type set in interceptor while doing a post request to upload a file.

thanks, Harshavardhan

Answer 1

To Remove Existing header

 if (!req.headers.has('Content-Type')) {
 req = req.clone({ headers: req.headers.delete('Content-Type','application/json') });

Adding new Headers

req = req.clone({ headers: req.headers.set('Content-Type', 'multipart/form-data')})

To check the current value of the header.

req.headers.get('Accept')