JS cannot get content disposition in headers

Problem recurrence

The front end realizes the export and download function

Here is the realization of Export function But when online There is The problem of export failure ;

We need to get the response header Content-Disposition Value of field , Separate the file name .

You can see here It's printed content-disposition

Online network You can also see that This filename ; But when I print it out from the request header , There is no such field ; So online export will fail

To analyze problems

Browsers limit the exposure of this kind of request headers ; Therefore, it needs the cooperation of the server ;

Solution

Although this is added to the back end ; But we can only network see , Unable to get js Get it in the request header Content-Disposition
So you need to add a piece of code

  response.setHeader("Access-Control-Expose-Headers","Content-Disposition");

effect

With this piece of code, you can export successfully ;

The back-end code is attached here