хмм, если убрать строчку "include /etc/nginx/fastcgi.conf;",
то пришлёт такое:

[I] Accepted connection on descriptor 5(host=127.0.0.1, port=42028)
count = 504
data:� HTTP_HOSTtest1.ru
HTTP_CONNECTIONkeep-alive HTTP_CACHE_CONTROLmax-age=0HTTP_UPGRADE_INSECURE_REQUESTS1iHTTP_USER_AGENTMozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.149 Safari/537.36
HTTP_ACCEPT_ENCODINGgzip, deflate#HTTP_ACCEPT_LANGUAGEru-RU,ru;q=0.9,en-US;q=0.8,en;q=0.7e/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
4096
count = -1
return false
count = 0
[I] Close 5
[I] Accepted connection on descriptor 5(host=127.0.0.1, port=42030)
count = 432
data:� HTTP_HOSTtest1.ru
HTTP_CONNECTIONkeep-alive
HTTP_PRAGMAno-cachHTTP_CACHE_CONTROLno-cacheiHTTP_USER_AGENTMozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.149 Safari/537.36
'HTTP_ACCEPTimage/webp,image/apng,image/*,*/*;q=0.8
HTTP_ACCEPT_ENCODINGgzip, deflate#HTTP_ACCEPT_LANGUAGEru-RU,ru;q=0.9,en-US;q=0.8,en;q=0.7
4096
count = -1
return false
count = 0
[I] Close 5