uWSGI. How to delete Content-Length header if Transfer-Encoding: chunked added?

Question

API always server return Content-Length header, I add response compression to the uWSGI and want to follow RFC. My try:
uwsgi.ini

http-keepalive = 1

response-route-if = contains:${HTTP_ACCEPT_ENCODING};gzip goto:compress
response-route-run = last:

response-route-label = compress
response-route-run = delheader:Content-Length
response-route-run = gzip:
response-route-run = chunked:

uWSGI 2.0.19.1

Result: Content-Length still here.
Expected result: Content-Length header deleted from response headers.