docs: Changed a word in the README

Makefile

@@ -23,7 +23,8 @@ docker-stop:
 docker-test: docker-local docker-stop
 	docker run -p 4567:4567 --name chhoto-url -e password="${PASSWORD}" -e public_mode="${PUBLIC_MODE}" \
 		-e site_url="${SITE_URL}" -e db_url="${DB_URL}" -e redirect_method="${REDIRECT_METHOD}" \
-		-e slug_style="${SLUG_STYLE}" -e slug_length="${SLUG_LENGTH}" -d chhoto-url
+		-e slug_style="${SLUG_STYLE}" -e slug_length="${SLUG_LENGTH}" -e cache_control_header="${CACHE_CONTROL_HEADER}"\
+		-d chhoto-url
 	docker logs chhoto-url -f
 
 docker-dev: build-dev

README.md

@@ -24,8 +24,8 @@ using the "feature request" template.
 
 ## But why another URL shortener?
 Most URL shorteners are either bloated with unnecessary features, or are a pain to set up.
-Even fewer are written with simplicity and lightness in mind. When I saw the simply-shorten
-project (linked below), I really liked the idea but thought that it missed some details. Also,
+Even fewer are written with simplicity and lightness in mind. When I saw the `simply-shorten`
+project (linked below), I really liked the idea but thought that it missed some features. Also,
 I didn't like the fact that a simple app like this had a ~200 MB docker image (mostly due to the
 included java runtime). So, I decided to rewrite it in Rust and add some features to it that I
 thought were essential (e.g. hit counting).
@@ -133,6 +133,10 @@ the `slug_length` variable. It defaults to 8, and a minimum of 4 is supported.
 To enable public mode, set `public_mode` to `Enable`. With this, anyone will be able to add 
 links. Listing existing links or deleting links will need admin access using the password.
 
+By default, the server sends `no-cache` and `private` Cache-Control headers. To disable those,
+set `cache_control_header` to `Disable`. It might help boost performance if served through a 
+proxy.
+
 ## Instructions for CLI usage
 The application can be used from the terminal using something like `curl`. In all the examples
 below, replace `http://localhost:4567` with where your instance of `chhoto-url` is accessible.

actix/src/main.rs

@@ -34,6 +34,11 @@ async fn main() -> Result<()> {
         .parse::<u16>()
         .expect("Supplied port is not an integer");
 
+    let cache_control_header = env::var("cache_control_header")
+        .ok()
+        .filter(|s| !s.trim().is_empty())
+        .unwrap_or(String::from("Enable"));
+
     // Actually start the server
     HttpServer::new(move || {
         App::new()
@@ -49,6 +54,11 @@ async fn main() -> Result<()> {
             .app_data(web::Data::new(AppState {
                 db: database::open_db(db_location.clone()),
             }))
+            .wrap(if cache_control_header == "Disable" {
+                middleware::DefaultHeaders::new()
+            } else {
+                middleware::DefaultHeaders::new().add(("Cache-Control", "no-cache, private"))
+            })
             .service(services::link_handler)
             .service(services::getall)
             .service(services::siteurl)

compose.yaml

@@ -9,32 +9,36 @@ services:
         ports:
             - 4567:4567
         environment:
-            # Change if you want to mount the database somewhere else
+            # Change if you want to mount the database somewhere else.
             # In this case, you can get rid of the db volume below
-            # and instead do a mount manually by specifying the location
+            # and instead do a mount manually by specifying the location.
             # - db_url=/urls.sqlite
 
             # Change it in case you want to set the website name
             # displayed in front of the shorturls, defaults to
-            # the hostname you're accessing it from
+            # the hostname you're accessing it from.
             # - site_url=https://www.example.com
 
             - password=$3CuReP4S$W0rD
             
-            # Pass the redirect method, if needed TEMPORARY and PERMANENT
-            # are accepted values, defaults to PERMANENT
+            # Pass the redirect method, if needed. TEMPORARY and PERMANENT
+            # are accepted values, defaults to PERMANENT.
             # - redirect_method=TEMPORARY
             
-            # By default, the auto-generated pairs are adjective-name pairs
-            # If you want UIDs, please change slug_style to UID
-            # Supported values for slug_style are Pair and UID
-            # The length is 8 by default, and a minimum of 4 is allowed
+            # By default, the auto-generated pairs are adjective-name pairs.
+            # If you want UIDs, please change slug_style to UID.
+            # Supported values for slug_style are Pair and UID.
+            # The length is 8 by default, and a minimum of 4 is allowed.
             # - slug_style=Pair
             # - slug_length=8
             
             # In case you want to provide public access to adding links (and not 
-            # delete, or listing), change the following option to Enable
+            # delete, or listing), change the following option to Enable.
             # - public_mode=Disable
+            
+            # By default, the server sends `no-cache` and `private` Cache-Control
+            # headers. To disable those, change the following option to Disable.
+            # - cache_control_header=Enable
         volumes:
             - db:/urls.sqlite
         networks: