Fastly error when reverse proxying - nginx

Question

I am trying to setup a caching reverse proxy for Contentful CDN using Nginx
my configuration is as follows:
http {
proxy_cache_path /my/cache levels=1:2 keys_zone=STATIC:10m inactive=24h max_size=1g;
log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
access_log /var/log/nginx/access.log main;
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;
include /etc/nginx/mime.types;
default_type application/octet-stream;
# Load modular configuration files from the /etc/nginx/conf.d directory.
# See http://nginx.org/en/docs/ngx_core_module.html#include
# for more information.
include /etc/nginx/conf.d/*.conf;
server {
listen 443 ssl;
server_name my.domain.com;
server_tokens off;
root /my/www/client;
index index.html;
try_files $uri $uri/ /index.html;
auth_basic "Private Property";
auth_basic_user_file /pass/.htpasswd;
ssl_certificate /my/ssl/cert.crt;
ssl_certificate_key /my/ssl/key.key;
ssl_dhparam /etc/ssl/certs/LS-dhparam.pem;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_prefer_server_ciphers on;
ssl_ciphers 'ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECD$
location /spaces {
index index.html index.htm;
charset utf-8;
proxy_pass http://cdn.contentful.com/spaces/spaceId/entries?access_token=accessTokenValue;
proxy_ignore_headers Cache-Control Expires;
proxy_cache STATIC;
proxy_cache_valid 200 10m;
proxy_cache_use_stale error timeout invalid_header updating http_500 http_502 http_503 http_504;
proxy_redirect off;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-Host $host;
proxy_set_header X-Forwarded-Server $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_For;
proxy_set_header Connection "";
proxy_http_version 1.1;
proxy_connect_timeout 90s;
proxy_send_timeout 90s;
proxy_read_timeout 90s;
proxy_buffer_size 4k;
proxy_buffers 4 32k;
proxy_busy_buffers_size 64k;
proxy_temp_file_write_size 64k;
send_timeout 90s;
}
}
}
Where of course the spaceId and accessTokenValue are the appropriate ones
I then trigger a request on https://my.domain.com/spaces/&content_type=myContent&locale=en
Which returns this error: Fastly error: unknown domain: my.domain.com. Please check that this domain has been added to a service.
It works when I try to use the full url being: http://cdn.contentful.com/spaces/spaceId/entries?access_token=accessTokenValue&content_type=myContent&locale=en
Is there something wrong with my nginx configuration or is there something from contentful's side?

Answer 1

You need to remove
proxy_set_header Host $host;
For this to work. Because when you proxy_pass to proxy_pass http://cdn.contentful.com/spaces/spaceId/entries?access_toke‌​n=accessTokenValue&$‌​query_string, you want the host name to remain as cdn.contentful.com and not change it