I use a custom http header for URL signature just called \"sign\", how to get such custom HTTP header value in Django?
From the Django documentation:
https://docs.djangoproject.com/en/2.1/ref/request-response/#django.http.HttpRequest.META
With the exception of CONTENT_LENGTH and CONTENT_TYPE, as given above, any HTTP headers in the request are converted to META keys by converting all characters to uppercase, replacing any hyphens with underscores and adding an HTTP_ prefix to the name. So, for example, a header called X-Bender would be mapped to the META key HTTP_X_BENDER.