request headers always been set by program default

[qq2267222680]

I found that the request initiated in this project is always overwritten by many request headers, especially the date request header I need, which will always be set to null. Therefore, in order to cause my request to be unable to be decrypted by HMAC, please ask the author teacher if there is a solution.

[qq2267222680]

The left headers is request in vue-element-template project. The right is the request fetch in nodejs project.
header date is gone.