Failed to start high performance web server and reverse proxy server nginx

UPDATE - I got these error logs:

nginx: [emerg] unknown "request_url" variable
Aug 19 01:14:58 nginx[4890]: nginx:
configuration file /etc/nginx/nginx.conf test failed


Here is my nginx.conf file:

user www-data;
worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;

events {
worker_connections 768;
# multi_accept on;
}

http {

##
# Basic Settings
##

sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;
# server_tokens off;

# server_names_hash_bucket_size 64;
# server_name_in_redirect off;

include /etc/nginx/mime.types;
default_type application/octet-stream;

##
# SSL Settings
##

ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # Dropping SSLv3, ref: POODLE
ssl_prefer_server_ciphers on;

##
# Logging Settings
##

access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;

##
# Gzip Settings
##

gzip on;

# gzip_vary on;
# gzip_proxied any;
# gzip_comp_level 6;
# gzip_buffers 16 8k;
# gzip_http_version 1.1;
# gzip_types text/plain text/css application/json application/javascript
text/xml application/xml application/xml+rss text/javascript;

##
# Virtual Host Configs
##


The "request url" part of the error could be in my sites-enabled/default file in the location block near the bottom:

server {
listen 80 default_server;
listen [::]:80 default_server;

# SSL configuration
#
listen 443 ssl default_server;
listen [::]:443 ssl default_server;
server_name www.domainname;
ssl_certificate /etc/nginx/ssl/server.crt;
ssl_certificate_key /etc/nginx/ssl/server.key;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_ciphers HIGH:!aNULL:!MD5;
#
# Note: You should disable gzip for SSL traffic.
# See: https://bugs.debian.org/773332
#
# Read up on ssl_ciphers to ensure a secure configuration.
# See: https://bugs.debian.org/765782
#
# Self signed certs generated by the ssl-cert package
# Don't use them in a production server!
#
# include snippets/snakeoil.conf;

root /var/www/html;

# Add index.php to the list if you are using PHP
index index.html index.htm index.nginx-debian.html;

server_name _;

location / {
# First attempt to serve request as file, then
# as directory, then fall back to displaying a 404.
try_files $uri $uri/ =404;

return 301 https://www.hobyn.co$request_url;


ORIGINAL QUESTION - I get the failed to start high performance web server and reverse proxy server when running:

sudo /etc/init.d/nginx restart


to restart nginx after making the server block configurations below to my /etc/nginx/sites-available/default file. My angular app is being served in /var/www/html:

server {
listen 80 default_server;
listen [::]:80 default_server;

# SSL configuration
#
listen 443 ssl default_server;
listen [::]:443 ssl default_server;
server_name www.mydomainname;
ssl_certificate /etc/nginx/ssl/****.crt;
ssl_certificate_key /etc/nginx/ssl/****.key;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_ciphers HIGH:!aNULL:!MD5;


location / {
# First attempt to serve request as file, then
# as directory, then fall back to displaying a 404.
try_files $uri $uri/ =404;

return 301 https://www.mydomainname$request_url;
}

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