location / {
proxy_pass http://image_server:8000;
}
In normal case, the proxy server will return image/png. But in other cases (for example out of bandwidth), it will throw application/json (with 200 HTTP) instead of images. So how to only accept images from the proxy, I want to show a 500 error page instead of it returning application/json from the proxy
An openresty/lua-ngx-module solution:
location / {
proxy_pass http://image_server:8000;
header_filter_by_lua_block {
if string.find( ngx.header.content_type, "json" ) then
ngx.exit(500)
end
}
}
or
location / {
proxy_pass http://image_server:8000;
header_filter_by_lua_block {
if string.find( ngx.header.content_type, "image/" ) == nil then
ngx.exit(500)
end
}
}