feat: add --location=<href> and globalThis.location (#7369)

20 files changed, 291 insertions, 176 deletions

diff --git a/cli/flags.rs b/cli/flags.rs
index da0f8ad0e..6b4e5aa5f 100644
--- a/cli/flags.rs
+++ b/cli/flags.rs
@@ -11,6 +11,7 @@ use deno_core::serde::Deserialize;
 use deno_core::serde::Deserializer;
 use deno_core::serde::Serialize;
 use deno_core::serde::Serializer;
+use deno_core::url::Url;
 use deno_runtime::permissions::PermissionsOptions;
 use log::Level;
 use std::fmt;
@@ -172,6 +173,7 @@ pub struct Flags {
   pub allow_read: Option<Vec<PathBuf>>,
   pub allow_run: bool,
   pub allow_write: Option<Vec<PathBuf>>,
+  pub location: Option<Url>,
   pub cache_blocklist: Vec<String>,
   pub ca_file: Option<String>,
   pub cached_only: bool,
@@ -324,19 +326,13 @@ lazy_static! {
 }
 
 /// Main entry point for parsing deno's command line flags.
-/// Exits the process on error.
-pub fn flags_from_vec(args: Vec<String>) -> Flags {
-  match flags_from_vec_safe(args) {
-    Ok(flags) => flags,
-    Err(err) => err.exit(),
-  }
-}
-
-/// Same as flags_from_vec but does not exit on error.
-pub fn flags_from_vec_safe(args: Vec<String>) -> clap::Result<Flags> {
+pub fn flags_from_vec(args: Vec<String>) -> clap::Result<Flags> {
   let version = crate::version::deno();
   let app = clap_root(&*version);
-  let matches = app.get_matches_from_safe(args)?;
+  let matches = app.get_matches_from_safe(args).map_err(|e| clap::Error {
+    message: e.message.trim_start_matches("error: ").to_string(),
+    ..e
+  })?;
 
   let mut flags = Flags::default();
 
@@ -597,7 +593,7 @@ fn eval_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
     print,
     code,
     as_typescript,
-  }
+  };
 }
 
 fn info_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
@@ -671,6 +667,7 @@ fn runtime_args<'a, 'b>(
   };
   app
     .arg(cached_only_arg())
+    .arg(location_arg())
     .arg(v8_flags_arg())
     .arg(seed_arg())
 }
@@ -689,8 +686,10 @@ fn runtime_args_parse(
   if include_inspector {
     inspect_arg_parse(flags, matches);
   }
+  location_arg_parse(flags, matches);
   v8_flags_arg_parse(flags, matches);
   seed_arg_parse(flags, matches);
+  inspect_arg_parse(flags, matches);
 }
 
 fn run_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
@@ -1487,6 +1486,30 @@ fn ca_file_arg_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
   flags.ca_file = matches.value_of("cert").map(ToOwned::to_owned);
 }
 
+fn location_arg_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
+  flags.location = matches
+    .value_of("location")
+    .map(|href| Url::parse(href).unwrap());
+}
+
+fn location_arg<'a, 'b>() -> Arg<'a, 'b> {
+  Arg::with_name("location")
+    .long("location")
+    .takes_value(true)
+    .value_name("HREF")
+    .validator(|href| {
+      let url = Url::parse(&href);
+      if url.is_err() {
+        return Err("Failed to parse URL".to_string());
+      }
+      if !["http", "https"].contains(&url.unwrap().scheme()) {
+        return Err("Expected protocol \"http\" or \"https\"".to_string());
+      }
+      Ok(())
+    })
+    .help("Value of 'globalThis.location' used by some web APIs")
+}
+
 fn inspect_args<'a, 'b>(app: App<'a, 'b>) -> App<'a, 'b> {
   app
     .arg(
@@ -1729,7 +1752,6 @@ fn permission_args_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
 // TODO(ry) move this to utility module and add test.
 /// Strips fragment part of URL. Panics on bad URL.
 pub fn resolve_urls(urls: Vec<String>) -> Vec<String> {
-  use deno_core::url::Url;
   let mut out: Vec<String> = vec![];
   for urlstr in urls.iter() {
     if let Ok(mut url) = Url::from_str(urlstr) {
@@ -1758,7 +1780,7 @@ mod tests {
   #[test]
   fn global_flags() {
     #[rustfmt::skip]
-    let r = flags_from_vec_safe(svec!["deno", "--unstable", "--log-level", "debug", "--quiet", "run", "script.ts"]);
+    let r = flags_from_vec(svec!["deno", "--unstable", "--log-level", "debug", "--quiet", "run", "script.ts"]);
     let flags = r.unwrap();
     assert_eq!(
       flags,
@@ -1772,15 +1794,14 @@ mod tests {
       }
     );
     #[rustfmt::skip]
-    let r2 = flags_from_vec_safe(svec!["deno", "run", "--unstable", "--log-level", "debug", "--quiet", "script.ts"]);
+    let r2 = flags_from_vec(svec!["deno", "run", "--unstable", "--log-level", "debug", "--quiet", "script.ts"]);
     let flags2 = r2.unwrap();
     assert_eq!(flags2, flags);
   }
 
   #[test]
   fn upgrade() {
-    let r =
-      flags_from_vec_safe(svec!["deno", "upgrade", "--dry-run", "--force"]);
+    let r = flags_from_vec(svec!["deno", "upgrade", "--dry-run", "--force"]);
     let flags = r.unwrap();
     assert_eq!(
       flags,
@@ -1800,15 +1821,15 @@ mod tests {
 
   #[test]
   fn version() {
-    let r = flags_from_vec_safe(svec!["deno", "--version"]);
+    let r = flags_from_vec(svec!["deno", "--version"]);
     assert_eq!(r.unwrap_err().kind, clap::ErrorKind::VersionDisplayed);
-    let r = flags_from_vec_safe(svec!["deno", "-V"]);
+    let r = flags_from_vec(svec!["deno", "-V"]);
     assert_eq!(r.unwrap_err().kind, clap::ErrorKind::VersionDisplayed);
   }
 
   #[test]
   fn run_reload() {
-    let r = flags_from_vec_safe(svec!["deno", "run", "-r", "script.ts"]);
+    let r = flags_from_vec(svec!["deno", "run", "-r", "script.ts"]);
     let flags = r.unwrap();
     assert_eq!(
       flags,
@@ -1824,7 +1845,7 @@ mod tests {
 
   #[test]
   fn run_watch() {
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "run",
       "--unstable",
@@ -1847,13 +1868,8 @@ mod tests {
 
   #[test]
   fn run_reload_allow_write() {
-    let r = flags_from_vec_safe(svec![
-      "deno",
-      "run",
-      "-r",
-      "--allow-write",
-      "script.ts"
-    ]);
+    let r =
+      flags_from_vec(svec!["deno", "run", "-r", "--allow-write", "script.ts"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -1869,7 +1885,7 @@ mod tests {
 
   #[test]
   fn run_v8_flags() {
-    let r = flags_from_vec_safe(svec!["deno", "run", "--v8-flags=--help"]);
+    let r = flags_from_vec(svec!["deno", "run", "--v8-flags=--help"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -1881,7 +1897,7 @@ mod tests {
       }
     );
 
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "run",
       "--v8-flags=--expose-gc,--gc-stats=1",
@@ -1901,7 +1917,7 @@ mod tests {
 
   #[test]
   fn script_args() {
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "run",
       "--allow-net",
@@ -1924,7 +1940,7 @@ mod tests {
 
   #[test]
   fn allow_all() {
-    let r = flags_from_vec_safe(svec!["deno", "run", "--allow-all", "gist.ts"]);
+    let r = flags_from_vec(svec!["deno", "run", "--allow-all", "gist.ts"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -1945,8 +1961,7 @@ mod tests {
 
   #[test]
   fn allow_read() {
-    let r =
-      flags_from_vec_safe(svec!["deno", "run", "--allow-read", "gist.ts"]);
+    let r = flags_from_vec(svec!["deno", "run", "--allow-read", "gist.ts"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -1961,8 +1976,7 @@ mod tests {
 
   #[test]
   fn allow_hrtime() {
-    let r =
-      flags_from_vec_safe(svec!["deno", "run", "--allow-hrtime", "gist.ts"]);
+    let r = flags_from_vec(svec!["deno", "run", "--allow-hrtime", "gist.ts"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -1980,7 +1994,7 @@ mod tests {
     // notice that flags passed after double dash will not
     // be parsed to Flags but instead forwarded to
     // script args as Deno.args
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "run",
       "--allow-write",
@@ -2004,8 +2018,7 @@ mod tests {
 
   #[test]
   fn fmt() {
-    let r =
-      flags_from_vec_safe(svec!["deno", "fmt", "script_1.ts", "script_2.ts"]);
+    let r = flags_from_vec(svec!["deno", "fmt", "script_1.ts", "script_2.ts"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -2021,7 +2034,7 @@ mod tests {
       }
     );
 
-    let r = flags_from_vec_safe(svec!["deno", "fmt", "--check"]);
+    let r = flags_from_vec(svec!["deno", "fmt", "--check"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -2034,7 +2047,7 @@ mod tests {
       }
     );
 
-    let r = flags_from_vec_safe(svec!["deno", "fmt"]);
+    let r = flags_from_vec(svec!["deno", "fmt"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -2047,7 +2060,7 @@ mod tests {
       }
     );
 
-    let r = flags_from_vec_safe(svec!["deno", "fmt", "--watch", "--unstable"]);
+    let r = flags_from_vec(svec!["deno", "fmt", "--watch", "--unstable"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -2062,7 +2075,7 @@ mod tests {
       }
     );
 
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "fmt",
       "--check",
@@ -2088,7 +2101,7 @@ mod tests {
 
   #[test]
   fn language_server() {
-    let r = flags_from_vec_safe(svec!["deno", "lsp"]);
+    let r = flags_from_vec(svec!["deno", "lsp"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -2100,7 +2113,7 @@ mod tests {
 
   #[test]
   fn lint() {
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "lint",
       "--unstable",
@@ -2124,7 +2137,7 @@ mod tests {
       }
     );
 
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "lint",
       "--unstable",
@@ -2147,7 +2160,7 @@ mod tests {
       }
     );
 
-    let r = flags_from_vec_safe(svec!["deno", "lint", "--unstable", "--rules"]);
+    let r = flags_from_vec(svec!["deno", "lint", "--unstable", "--rules"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -2162,7 +2175,7 @@ mod tests {
       }
     );
 
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "lint",
       "--unstable",
@@ -2186,7 +2199,7 @@ mod tests {
 
   #[test]
   fn types() {
-    let r = flags_from_vec_safe(svec!["deno", "types"]);
+    let r = flags_from_vec(svec!["deno", "types"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -2198,7 +2211,7 @@ mod tests {
 
   #[test]
   fn cache() {
-    let r = flags_from_vec_safe(svec!["deno", "cache", "script.ts"]);
+    let r = flags_from_vec(svec!["deno", "cache", "script.ts"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -2212,7 +2225,7 @@ mod tests {
 
   #[test]
   fn info() {
-    let r = flags_from_vec_safe(svec!["deno", "info", "script.ts"]);
+    let r = flags_from_vec(svec!["deno", "info", "script.ts"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -2224,7 +2237,7 @@ mod tests {
       }
     );
 
-    let r = flags_from_vec_safe(svec!["deno", "info", "--reload", "script.ts"]);
+    let r = flags_from_vec(svec!["deno", "info", "--reload", "script.ts"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -2237,7 +2250,7 @@ mod tests {
       }
     );
 
-    let r = flags_from_vec_safe(svec!["deno", "info", "--json", "script.ts"]);
+    let r = flags_from_vec(svec!["deno", "info", "--json", "script.ts"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -2249,7 +2262,7 @@ mod tests {
       }
     );
 
-    let r = flags_from_vec_safe(svec!["deno", "info"]);
+    let r = flags_from_vec(svec!["deno", "info"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -2261,7 +2274,7 @@ mod tests {
       }
     );
 
-    let r = flags_from_vec_safe(svec!["deno", "info", "--json"]);
+    let r = flags_from_vec(svec!["deno", "info", "--json"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -2276,13 +2289,8 @@ mod tests {
 
   #[test]
   fn tsconfig() {
-    let r = flags_from_vec_safe(svec![
-      "deno",
-      "run",
-      "-c",
-      "tsconfig.json",
-      "script.ts"
-    ]);
+    let r =
+      flags_from_vec(svec!["deno", "run", "-c", "tsconfig.json", "script.ts"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -2297,8 +2305,7 @@ mod tests {
 
   #[test]
   fn eval() {
-    let r =
-      flags_from_vec_safe(svec!["deno", "eval", "'console.log(\"hello\")'"]);
+    let r = flags_from_vec(svec!["deno", "eval", "'console.log(\"hello\")'"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -2321,7 +2328,7 @@ mod tests {
 
   #[test]
   fn eval_p() {
-    let r = flags_from_vec_safe(svec!["deno", "eval", "-p", "1+2"]);
+    let r = flags_from_vec(svec!["deno", "eval", "-p", "1+2"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -2344,12 +2351,8 @@ mod tests {
 
   #[test]
   fn eval_typescript() {
-    let r = flags_from_vec_safe(svec![
-      "deno",
-      "eval",
-      "-T",
-      "'console.log(\"hello\")'"
-    ]);
+    let r =
+      flags_from_vec(svec!["deno", "eval", "-T", "'console.log(\"hello\")'"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -2373,7 +2376,7 @@ mod tests {
   #[test]
   fn eval_with_flags() {
     #[rustfmt::skip]
-    let r = flags_from_vec_safe(svec!["deno", "eval", "--unstable", "--import-map", "import_map.json", "--no-remote", "--config", "tsconfig.json", "--no-check", "--reload", "--lock", "lock.json", "--lock-write", "--cert", "example.crt", "--cached-only", "--v8-flags=--help", "--seed", "1", "--inspect=127.0.0.1:9229", "42"]);
+    let r = flags_from_vec(svec!["deno", "eval", "--unstable", "--import-map", "import_map.json", "--no-remote", "--config", "tsconfig.json", "--no-check", "--reload", "--lock", "lock.json", "--lock-write", "--cert", "example.crt", "--cached-only", "--location", "https:foo", "--v8-flags=--help", "--seed", "1", "--inspect=127.0.0.1:9229", "42"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -2392,6 +2395,7 @@ mod tests {
         lock_write: true,
         ca_file: Some("example.crt".to_string()),
         cached_only: true,
+        location: Some(Url::parse("https://foo/").unwrap()),
         v8_flags: svec!["--help", "--random-seed=1"],
         seed: Some(1),
         inspect: Some("127.0.0.1:9229".parse().unwrap()),
@@ -2409,7 +2413,7 @@ mod tests {
 
   #[test]
   fn eval_args() {
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "eval",
       "console.log(Deno.args)",
@@ -2439,7 +2443,7 @@ mod tests {
 
   #[test]
   fn repl() {
-    let r = flags_from_vec_safe(svec!["deno"]);
+    let r = flags_from_vec(svec!["deno"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -2460,7 +2464,7 @@ mod tests {
   #[test]
   fn repl_with_flags() {
     #[rustfmt::skip]
-    let r = flags_from_vec_safe(svec!["deno", "repl", "--unstable", "--import-map", "import_map.json", "--no-remote", "--config", "tsconfig.json", "--no-check", "--reload", "--lock", "lock.json", "--lock-write", "--cert", "example.crt", "--cached-only", "--v8-flags=--help", "--seed", "1", "--inspect=127.0.0.1:9229"]);
+    let r = flags_from_vec(svec!["deno", "repl", "--unstable", "--import-map", "import_map.json", "--no-remote", "--config", "tsconfig.json", "--no-check", "--reload", "--lock", "lock.json", "--lock-write", "--cert", "example.crt", "--cached-only", "--location", "https:foo", "--v8-flags=--help", "--seed", "1", "--inspect=127.0.0.1:9229"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -2476,6 +2480,7 @@ mod tests {
         lock_write: true,
         ca_file: Some("example.crt".to_string()),
         cached_only: true,
+        location: Some(Url::parse("https://foo/").unwrap()),
         v8_flags: svec!["--help", "--random-seed=1"],
         seed: Some(1),
         inspect: Some("127.0.0.1:9229".parse().unwrap()),
@@ -2496,7 +2501,7 @@ mod tests {
     use tempfile::TempDir;
     let temp_dir = TempDir::new().expect("tempdir fail").path().to_path_buf();
 
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "run",
       format!("--allow-read=.,{}", temp_dir.to_str().unwrap()),
@@ -2519,7 +2524,7 @@ mod tests {
     use tempfile::TempDir;
     let temp_dir = TempDir::new().expect("tempdir fail").path().to_path_buf();
 
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "run",
       format!("--allow-write=.,{}", temp_dir.to_str().unwrap()),
@@ -2539,7 +2544,7 @@ mod tests {
 
   #[test]
   fn allow_net_allowlist() {
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "run",
       "--allow-net=127.0.0.1",
@@ -2559,7 +2564,7 @@ mod tests {
 
   #[test]
   fn bundle() {
-    let r = flags_from_vec_safe(svec!["deno", "bundle", "source.ts"]);
+    let r = flags_from_vec(svec!["deno", "bundle", "source.ts"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -2574,7 +2579,7 @@ mod tests {
 
   #[test]
   fn bundle_with_config() {
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "bundle",
       "--no-remote",
@@ -2600,8 +2605,7 @@ mod tests {
 
   #[test]
   fn bundle_with_output() {
-    let r =
-      flags_from_vec_safe(svec!["deno", "bundle", "source.ts", "bundle.js"]);
+    let r = flags_from_vec(svec!["deno", "bundle", "source.ts", "bundle.js"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -2617,7 +2621,7 @@ mod tests {
 
   #[test]
   fn bundle_with_lock() {
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "bundle",
       "--lock-write",
@@ -2640,8 +2644,7 @@ mod tests {
 
   #[test]
   fn bundle_with_reload() {
-    let r =
-      flags_from_vec_safe(svec!["deno", "bundle", "--reload", "source.ts"]);
+    let r = flags_from_vec(svec!["deno", "bundle", "--reload", "source.ts"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -2657,9 +2660,8 @@ mod tests {
 
   #[test]
   fn bundle_nocheck() {
-    let r =
-      flags_from_vec_safe(svec!["deno", "bundle", "--no-check", "script.ts"])
-        .unwrap();
+    let r = flags_from_vec(svec!["deno", "bundle", "--no-check", "script.ts"])
+      .unwrap();
     assert_eq!(
       r,
       Flags {
@@ -2675,7 +2677,7 @@ mod tests {
 
   #[test]
   fn bundle_watch() {
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "bundle",
       "--watch",
@@ -2698,7 +2700,7 @@ mod tests {
 
   #[test]
   fn run_import_map() {
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "run",
       "--unstable",
@@ -2720,7 +2722,7 @@ mod tests {
 
   #[test]
   fn info_import_map() {
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "info",
       "--unstable",
@@ -2743,7 +2745,7 @@ mod tests {
 
   #[test]
   fn cache_import_map() {
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "cache",
       "--unstable",
@@ -2765,7 +2767,7 @@ mod tests {
 
   #[test]
   fn doc_import_map() {
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "doc",
       "--unstable",
@@ -2791,7 +2793,7 @@ mod tests {
   #[test]
   fn cache_multiple() {
     let r =
-      flags_from_vec_safe(svec!["deno", "cache", "script.ts", "script_two.ts"]);
+      flags_from_vec(svec!["deno", "cache", "script.ts", "script_two.ts"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -2805,8 +2807,7 @@ mod tests {
 
   #[test]
   fn run_seed() {
-    let r =
-      flags_from_vec_safe(svec!["deno", "run", "--seed", "250", "script.ts"]);
+    let r = flags_from_vec(svec!["deno", "run", "--seed", "250", "script.ts"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -2822,7 +2823,7 @@ mod tests {
 
   #[test]
   fn run_seed_with_v8_flags() {
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "run",
       "--seed",
@@ -2845,7 +2846,7 @@ mod tests {
 
   #[test]
   fn install() {
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "install",
       "https://deno.land/std/examples/colors.ts"
@@ -2868,7 +2869,7 @@ mod tests {
   #[test]
   fn install_with_flags() {
     #[rustfmt::skip]
-    let r = flags_from_vec_safe(svec!["deno", "install", "--unstable", "--import-map", "import_map.json", "--no-remote", "--config", "tsconfig.json", "--no-check", "--reload", "--lock", "lock.json", "--lock-write", "--cert", "example.crt", "--cached-only", "--allow-read", "--allow-net", "--v8-flags=--help", "--seed", "1", "--inspect=127.0.0.1:9229", "--name", "file_server", "--root", "/foo", "--force", "https://deno.land/std/http/file_server.ts", "foo", "bar"]);
+    let r = flags_from_vec(svec!["deno", "install", "--unstable", "--import-map", "import_map.json", "--no-remote", "--config", "tsconfig.json", "--no-check", "--reload", "--lock", "lock.json", "--lock-write", "--cert", "example.crt", "--cached-only", "--allow-read", "--allow-net", "--v8-flags=--help", "--seed", "1", "--inspect=127.0.0.1:9229", "--name", "file_server", "--root", "/foo", "--force", "https://deno.land/std/http/file_server.ts", "foo", "bar"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -2901,12 +2902,8 @@ mod tests {
 
   #[test]
   fn log_level() {
-    let r = flags_from_vec_safe(svec![
-      "deno",
-      "run",
-      "--log-level=debug",
-      "script.ts"
-    ]);
+    let r =
+      flags_from_vec(svec!["deno", "run", "--log-level=debug", "script.ts"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -2921,7 +2918,7 @@ mod tests {
 
   #[test]
   fn quiet() {
-    let r = flags_from_vec_safe(svec!["deno", "run", "-q", "script.ts"]);
+    let r = flags_from_vec(svec!["deno", "run", "-q", "script.ts"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -2936,7 +2933,7 @@ mod tests {
 
   #[test]
   fn completions() {
-    let r = flags_from_vec_safe(svec!["deno", "completions", "zsh"]).unwrap();
+    let r = flags_from_vec(svec!["deno", "completions", "zsh"]).unwrap();
 
     match r.subcommand {
       DenoSubcommand::Completions { buf } => assert!(!buf.is_empty()),
@@ -2946,7 +2943,7 @@ mod tests {
 
   #[test]
   fn run_with_args() {
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "run",
       "script.ts",
@@ -2963,9 +2960,11 @@ mod tests {
         ..Flags::default()
       }
     );
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "run",
+      "--location",
+      "https:foo",
       "--allow-read",
       "script.ts",
       "--allow-net",
@@ -2980,14 +2979,14 @@ mod tests {
         subcommand: DenoSubcommand::Run {
           script: "script.ts".to_string(),
         },
+        location: Some(Url::parse("https://foo/").unwrap()),
         allow_read: Some(vec![]),
         argv: svec!["--allow-net", "-r", "--help", "--foo", "bar"],
         ..Flags::default()
       }
     );
 
-    let r =
-      flags_from_vec_safe(svec!["deno", "run", "script.ts", "foo", "bar"]);
+    let r = flags_from_vec(svec!["deno", "run", "script.ts", "foo", "bar"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -2998,7 +2997,7 @@ mod tests {
         ..Flags::default()
       }
     );
-    let r = flags_from_vec_safe(svec!["deno", "run", "script.ts", "-"]);
+    let r = flags_from_vec(svec!["deno", "run", "script.ts", "-"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -3011,7 +3010,7 @@ mod tests {
     );
 
     let r =
-      flags_from_vec_safe(svec!["deno", "run", "script.ts", "-", "foo", "bar"]);
+      flags_from_vec(svec!["deno", "run", "script.ts", "-", "foo", "bar"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -3026,8 +3025,7 @@ mod tests {
 
   #[test]
   fn no_check() {
-    let r =
-      flags_from_vec_safe(svec!["deno", "run", "--no-check", "script.ts"]);
+    let r = flags_from_vec(svec!["deno", "run", "--no-check", "script.ts"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -3042,8 +3040,7 @@ mod tests {
 
   #[test]
   fn no_remote() {
-    let r =
-      flags_from_vec_safe(svec!["deno", "run", "--no-remote", "script.ts"]);
+    let r = flags_from_vec(svec!["deno", "run", "--no-remote", "script.ts"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -3058,8 +3055,7 @@ mod tests {
 
   #[test]
   fn cached_only() {
-    let r =
-      flags_from_vec_safe(svec!["deno", "run", "--cached-only", "script.ts"]);
+    let r = flags_from_vec(svec!["deno", "run", "--cached-only", "script.ts"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -3074,7 +3070,7 @@ mod tests {
 
   #[test]
   fn allow_net_allowlist_with_ports() {
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "run",
       "--allow-net=deno.land,:8000,:4545",
@@ -3102,7 +3098,7 @@ mod tests {
 
   #[test]
   fn allow_net_allowlist_with_ipv6_address() {
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "run",
       "--allow-net=deno.land,deno.land:80,::,127.0.0.1,[::1],1.2.3.4:5678,:5678,[::1]:8080",
@@ -3133,7 +3129,7 @@ mod tests {
 
   #[test]
   fn lock_write() {
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "run",
       "--lock-write",
@@ -3156,7 +3152,7 @@ mod tests {
   #[test]
   fn test_with_flags() {
     #[rustfmt::skip]
-    let r = flags_from_vec_safe(svec!["deno", "test", "--unstable", "--no-run", "--filter", "- foo", "--coverage=cov", "--allow-net", "--allow-none", "dir1/", "dir2/", "--", "arg1", "arg2"]);
+    let r = flags_from_vec(svec!["deno", "test", "--unstable", "--no-run", "--filter", "- foo", "--coverage=cov", "--location", "https:foo", "--allow-net", "--allow-none", "dir1/", "dir2/", "--", "arg1", "arg2"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -3170,6 +3166,7 @@ mod tests {
         },
         unstable: true,
         coverage_dir: Some("cov".to_string()),
+        location: Some(Url::parse("https://foo/").unwrap()),
         allow_net: Some(vec![]),
         argv: svec!["arg1", "arg2"],
         ..Flags::default()
@@ -3179,7 +3176,7 @@ mod tests {
 
   #[test]
   fn run_with_cafile() {
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "run",
       "--cert",
@@ -3200,7 +3197,7 @@ mod tests {
 
   #[test]
   fn bundle_with_cafile() {
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "bundle",
       "--cert",
@@ -3222,8 +3219,7 @@ mod tests {
 
   #[test]
   fn upgrade_with_ca_file() {
-    let r =
-      flags_from_vec_safe(svec!["deno", "upgrade", "--cert", "example.crt"]);
+    let r = flags_from_vec(svec!["deno", "upgrade", "--cert", "example.crt"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -3243,7 +3239,7 @@ mod tests {
 
   #[test]
   fn cache_with_cafile() {
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "cache",
       "--cert",
@@ -3265,7 +3261,7 @@ mod tests {
 
   #[test]
   fn info_with_cafile() {
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "info",
       "--cert",
@@ -3287,8 +3283,7 @@ mod tests {
 
   #[test]
   fn doc() {
-    let r =
-      flags_from_vec_safe(svec!["deno", "doc", "--json", "path/to/module.ts"]);
+    let r = flags_from_vec(svec!["deno", "doc", "--json", "path/to/module.ts"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -3302,7 +3297,7 @@ mod tests {
       }
     );
 
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "doc",
       "path/to/module.ts",
@@ -3321,7 +3316,7 @@ mod tests {
       }
     );
 
-    let r = flags_from_vec_safe(svec!["deno", "doc"]);
+    let r = flags_from_vec(svec!["deno", "doc"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -3335,8 +3330,7 @@ mod tests {
       }
     );
 
-    let r =
-      flags_from_vec_safe(svec!["deno", "doc", "--builtin", "Deno.Listener"]);
+    let r = flags_from_vec(svec!["deno", "doc", "--builtin", "Deno.Listener"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -3350,12 +3344,8 @@ mod tests {
       }
     );
 
-    let r = flags_from_vec_safe(svec![
-      "deno",
-      "doc",
-      "--private",
-      "path/to/module.js"
-    ]);
+    let r =
+      flags_from_vec(svec!["deno", "doc", "--private", "path/to/module.js"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -3372,7 +3362,7 @@ mod tests {
 
   #[test]
   fn inspect_default_host() {
-    let r = flags_from_vec_safe(svec!["deno", "run", "--inspect", "foo.js"]);
+    let r = flags_from_vec(svec!["deno", "run", "--inspect", "foo.js"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -3387,7 +3377,7 @@ mod tests {
 
   #[test]
   fn compile() {
-    let r = flags_from_vec_safe(svec![
+    let r = flags_from_vec(svec![
       "deno",
       "compile",
       "https://deno.land/std/examples/colors.ts"
@@ -3408,7 +3398,7 @@ mod tests {
   #[test]
   fn compile_with_flags() {
     #[rustfmt::skip]
-    let r = flags_from_vec_safe(svec!["deno", "compile", "--unstable", "--import-map", "import_map.json", "--no-remote", "--config", "tsconfig.json", "--no-check", "--reload", "--lock", "lock.json", "--lock-write", "--cert", "example.crt", "--cached-only", "--allow-read", "--allow-net", "--v8-flags=--help", "--seed", "1", "--output", "colors", "https://deno.land/std/examples/colors.ts", "foo", "bar"]);
+    let r = flags_from_vec(svec!["deno", "compile", "--unstable", "--import-map", "import_map.json", "--no-remote", "--config", "tsconfig.json", "--no-check", "--reload", "--lock", "lock.json", "--lock-write", "--cert", "example.crt", "--cached-only", "--location", "https:foo", "--allow-read", "--allow-net", "--v8-flags=--help", "--seed", "1", "--output", "colors", "https://deno.land/std/examples/colors.ts", "foo", "bar"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -3427,6 +3417,7 @@ mod tests {
         lock_write: true,
         ca_file: Some("example.crt".to_string()),
         cached_only: true,
+        location: Some(Url::parse("https://foo/").unwrap()),
         allow_read: Some(vec![]),
         allow_net: Some(vec![]),
         v8_flags: svec!["--help", "--random-seed=1"],
diff --git a/cli/main.rs b/cli/main.rs
index 8210eb5c7..066991624 100644
--- a/cli/main.rs
+++ b/cli/main.rs
@@ -204,6 +204,7 @@ pub fn create_main_worker(
     ts_version: version::TYPESCRIPT.to_string(),
     no_color: !colors::use_color(),
     get_error_class_fn: Some(&crate::errors::get_error_class_name),
+    location: program_state.flags.location.clone(),
   };
 
   let mut worker = MainWorker::from_options(main_module, permissions, &options);
@@ -1223,6 +1224,21 @@ fn get_subcommand(
   }
 }
 
+fn unwrap_or_exit<T>(result: Result<T, AnyError>) -> T {
+  match result {
+    Ok(value) => value,
+    Err(error) => {
+      let msg = format!(
+        "{}: {}",
+        colors::red_bold("error"),
+        error.to_string().trim()
+      );
+      eprintln!("{}", msg);
+      std::process::exit(1);
+    }
+  }
+}
+
 pub fn main() {
   #[cfg(windows)]
   colors::enable_ansi(); // For Windows 10
@@ -1233,16 +1249,12 @@ pub fn main() {
     std::process::exit(1);
   }
 
-  let flags = flags::flags_from_vec(args);
+  let flags =
+    unwrap_or_exit(flags::flags_from_vec(args).map_err(AnyError::from));
   if !flags.v8_flags.is_empty() {
     init_v8_flags(&*flags.v8_flags);
   }
   init_logger(flags.log_level);
 
-  let subcommand_future = get_subcommand(flags);
-  let result = tokio_util::run_basic(subcommand_future);
-  if let Err(err) = result {
-    eprintln!("{}: {}", colors::red_bold("error"), err.to_string());
-    std::process::exit(1);
-  }
+  unwrap_or_exit(tokio_util::run_basic(get_subcommand(flags)));
 }
diff --git a/cli/standalone.rs b/cli/standalone.rs
index 8379358a0..8d95d30f2 100644
--- a/cli/standalone.rs
+++ b/cli/standalone.rs
@@ -167,7 +167,7 @@ async fn run(source_code: String, metadata: Metadata) -> Result<(), AnyError> {
   // TODO(nayeemrmn): Unify this Flags -> WorkerOptions mapping with `deno run`.
   let options = WorkerOptions {
     apply_source_maps: false,
-    args: flags.argv.clone(),
+    args: flags.argv,
     debug_flag: flags.log_level.map_or(false, |l| l == log::Level::Debug),
     user_agent: crate::http_util::get_user_agent(),
     unstable: flags.unstable,
@@ -183,6 +183,7 @@ async fn run(source_code: String, metadata: Metadata) -> Result<(), AnyError> {
     ts_version: version::TYPESCRIPT.to_string(),
     no_color: !colors::use_color(),
     get_error_class_fn: Some(&crate::errors::get_error_class_name),
+    location: flags.location,
   };
   let mut worker =
     MainWorker::from_options(main_module.clone(), permissions, &options);
@@ -297,6 +298,7 @@ pub fn compile_to_runtime_flags(
     import_map_path: None,
     inspect: None,
     inspect_brk: None,
+    location: flags.location,
     lock: None,
     lock_write: false,
     log_level: flags.log_level,
diff --git a/cli/tests/070_location.ts b/cli/tests/070_location.ts
new file mode 100644
index 000000000..62fd34af2
--- /dev/null
+++ b/cli/tests/070_location.ts
@@ -0,0 +1,10 @@
+// TODO(nayeemrmn): Add `Location` and `location` to `dlint`'s globals.
+// deno-lint-ignore-file no-undef
+console.log(Location);
+console.log(Location.prototype);
+console.log(location);
+try {
+  location.hostname = "bar";
+} catch (error) {
+  console.log(error);
+}
diff --git a/cli/tests/070_location.ts.out b/cli/tests/070_location.ts.out
new file mode 100644
index 000000000..66d470b6f
--- /dev/null
+++ b/cli/tests/070_location.ts.out
@@ -0,0 +1,22 @@
+[WILDCARD][Function: Location]
+Location { [Symbol(Symbol.toStringTag)]: "Location" }
+Location {
+  hash: [Getter/Setter],
+  host: [Getter/Setter],
+  hostname: [Getter/Setter],
+  href: [Getter/Setter],
+  origin: [Getter],
+  password: [Getter/Setter],
+  pathname: [Getter/Setter],
+  port: [Getter/Setter],
+  protocol: [Getter/Setter],
+  search: [Getter/Setter],
+  username: [Getter/Setter],
+  ancestorOrigins: [Getter],
+  assign: [Function: assign],
+  reload: [Function: reload],
+  replace: [Function: replace],
+  toString: [Function: toString]
+}
+NotSupportedError: Cannot set "location.hostname".
+[WILDCARD]
diff --git a/cli/tests/071_location_unset.ts b/cli/tests/071_location_unset.ts
new file mode 100644
index 000000000..5c0518940
--- /dev/null
+++ b/cli/tests/071_location_unset.ts
@@ -0,0 +1,5 @@
+// TODO(nayeemrmn): Add `Location` and `location` to `dlint`'s globals.
+// deno-lint-ignore-file no-undef
+console.log(Location);
+console.log(Location.prototype);
+console.log(location);
diff --git a/cli/tests/071_location_unset.ts.out b/cli/tests/071_location_unset.ts.out
new file mode 100644
index 000000000..2c030a773
--- /dev/null
+++ b/cli/tests/071_location_unset.ts.out
@@ -0,0 +1,4 @@
+[WILDCARD][Function: Location]
+Location { [Symbol(Symbol.toStringTag)]: "Location" }
+error: Uncaught ReferenceError: Access to "location", run again with --location <href>.
+[WILDCARD]
diff --git a/cli/tests/072_location_relative_fetch.ts b/cli/tests/072_location_relative_fetch.ts
new file mode 100644
index 000000000..d4764bf7f
--- /dev/null
+++ b/cli/tests/072_location_relative_fetch.ts
@@ -0,0 +1,2 @@
+const response = await fetch("fetch/hello.txt");
+console.log(await response.text());
diff --git a/cli/tests/072_location_relative_fetch.ts.out b/cli/tests/072_location_relative_fetch.ts.out
new file mode 100644
index 000000000..8151f6f88
--- /dev/null
+++ b/cli/tests/072_location_relative_fetch.ts.out
@@ -0,0 +1,2 @@
+[WILDCARD]Hello, world!
+
diff --git a/cli/tests/077_fetch_empty.ts b/cli/tests/077_fetch_empty.ts
new file mode 100644
index 000000000..b10a9094e
--- /dev/null
+++ b/cli/tests/077_fetch_empty.ts
@@ -0,0 +1 @@
+await fetch("");
diff --git a/cli/tests/077_fetch_empty.ts.out b/cli/tests/077_fetch_empty.ts.out
new file mode 100644
index 000000000..9dfccf10c
--- /dev/null
+++ b/cli/tests/077_fetch_empty.ts.out
@@ -0,0 +1,2 @@
+[WILDCARD]error: Uncaught (in promise) URIError: relative URL without a base
+[WILDCARD]
diff --git a/cli/tests/complex_permissions_test.ts b/cli/tests/complex_permissions_test.ts
index fba761a2c..002d33540 100644
--- a/cli/tests/complex_permissions_test.ts
+++ b/cli/tests/complex_permissions_test.ts
@@ -10,8 +10,8 @@ const test: { [key: string]: (...args: any[]) => void | Promise<void> } = {
       Deno.writeFileSync(file, new Uint8Array(0), { append: true })
     );
   },
-  netFetch(hosts: string[]): void {
-    hosts.forEach((host) => fetch(host));
+  netFetch(urls: string[]): void {
+    urls.forEach((url) => fetch(url));
   },
   netListen(endpoints: string[]): void {
     endpoints.forEach((endpoint) => {
diff --git a/cli/tests/fetch/hello.txt b/cli/tests/fetch/hello.txt
new file mode 100644
index 000000000..af5626b4a
--- /dev/null
+++ b/cli/tests/fetch/hello.txt
@@ -0,0 +1 @@
+Hello, world!
diff --git a/cli/tests/integration_tests.rs b/cli/tests/integration_tests.rs
index 68cfe0b50..aabeb1f77 100644
--- a/cli/tests/integration_tests.rs
+++ b/cli/tests/integration_tests.rs
@@ -1246,7 +1246,7 @@ fn bundle_import_map_no_check() {
     .current_dir(util::root_path())
     .arg("bundle")
     .arg("--no-check")
-    .arg("--importmap")
+    .arg("--import-map")
     .arg(import_map_path)
     .arg("--unstable")
     .arg(import)
@@ -1689,7 +1689,7 @@ fn repl_test_pty_bad_input() {
 
 #[test]
 #[ignore]
-fn run_watch_with_importmap_and_relative_paths() {
+fn run_watch_with_import_map_and_relative_paths() {
   fn create_relative_tmp_file(
     directory: &TempDir,
     filename: &'static str,
@@ -1722,7 +1722,7 @@ fn run_watch_with_importmap_and_relative_paths() {
     .arg("run")
     .arg("--unstable")
     .arg("--watch")
-    .arg("--importmap")
+    .arg("--import-map")
     .arg(&import_map_path)
     .arg(&file_to_watch)
     .env("NO_COLOR", "1")
@@ -2307,6 +2307,8 @@ fn workers() {
     .current_dir(util::tests_path())
     .arg("test")
     .arg("--reload")
+    .arg("--location")
+    .arg("http://127.0.0.1:4545/cli/tests/")
     .arg("--allow-net")
     .arg("--allow-read")
     .arg("--unstable")
@@ -2548,6 +2550,23 @@ itest!(_067_test_no_run_type_error {
   exit_code: 1,
 });
 
+itest!(_070_location {
+  args: "run --location https://foo/bar?baz#bat 070_location.ts",
+  output: "070_location.ts.out",
+});
+
+itest!(_071_location_unset {
+  args: "run 071_location_unset.ts",
+  output: "071_location_unset.ts.out",
+  exit_code: 1,
+});
+
+itest!(_072_location_relative_fetch {
+  args: "run --location http://127.0.0.1:4545/cli/tests/ --allow-net 072_location_relative_fetch.ts",
+  output: "072_location_relative_fetch.ts.out",
+  http_server: true,
+});
+
 itest!(_073_worker_error {
   args: "run -A 073_worker_error.ts",
   output: "073_worker_error.ts.out",
@@ -2570,6 +2589,12 @@ itest!(_076_info_json_deps_order {
   output: "076_info_json_deps_order.out",
 });
 
+itest!(_077_fetch_empty {
+  args: "run -A 077_fetch_empty.ts",
+  output: "077_fetch_empty.ts.out",
+  exit_code: 1,
+});
+
 itest!(js_import_detect {
   args: "run --quiet --reload js_import_detect.ts",
   output: "js_import_detect.ts.out",
@@ -5200,16 +5225,14 @@ fn web_platform_tests() {
           .tempfile()
           .unwrap();
 
-        let bundle = concat_bundle(
-          files,
-          file.path(),
-          format!("window.location = {{search: \"{}\"}};\n", variant),
-        );
+        let bundle = concat_bundle(files, file.path(), "".to_string());
         file.write_all(bundle.as_bytes()).unwrap();
 
         let child = util::deno_cmd()
           .current_dir(test_file_path.parent().unwrap())
           .arg("run")
+          .arg("--location")
+          .arg(&format!("http://web-platform-tests/?{}", variant))
           .arg("-A")
           .arg(file.path())
           .arg(deno_core::serde_json::to_string(&expect_fail).unwrap())
diff --git a/cli/tests/subdir/worker_location.ts b/cli/tests/subdir/worker_location.ts
new file mode 100644
index 000000000..480032350
--- /dev/null
+++ b/cli/tests/subdir/worker_location.ts
@@ -0,0 +1,4 @@
+onmessage = function (): void {
+  postMessage(self.location.href);
+  close();
+};
diff --git a/cli/tests/unit/fetch_test.ts b/cli/tests/unit/fetch_test.ts
index e5389d024..6945b2e2a 100644
--- a/cli/tests/unit/fetch_test.ts
+++ b/cli/tests/unit/fetch_test.ts
@@ -221,17 +221,6 @@ unitTest({ perms: { net: true } }, async function responseClone(): Promise<
   }
 });
 
-unitTest({ perms: { net: true } }, async function fetchEmptyInvalid(): Promise<
-  void
-> {
-  await assertThrowsAsync(
-    async () => {
-      await fetch("");
-    },
-    URIError,
-  );
-});
-
 unitTest(
   { perms: { net: true } },
   async function fetchMultipartFormDataSuccess(): Promise<void> {
diff --git a/cli/tests/unit/request_test.ts b/cli/tests/unit/request_test.ts
index 8132e0184..da6a0e15b 100644
--- a/cli/tests/unit/request_test.ts
+++ b/cli/tests/unit/request_test.ts
@@ -1,5 +1,5 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
-import { assert, assertEquals, assertThrows, unitTest } from "./test_util.ts";
+import { assert, assertEquals, unitTest } from "./test_util.ts";
 
 unitTest(function fromInit(): void {
   const req = new Request("http://foo/", {
@@ -46,8 +46,10 @@ unitTest(function methodNonString(): void {
 });
 
 unitTest(function requestRelativeUrl(): void {
-  // TODO(nayeemrmn): Base from `--location` when implemented and set.
-  assertThrows(() => new Request("relative-url"), TypeError, "Invalid URL.");
+  assertEquals(
+    new Request("relative-url").url,
+    "http://js-unit-tests/foo/relative-url",
+  );
 });
 
 unitTest(async function cloneRequestBodyStream(): Promise<void> {
diff --git a/cli/tests/unit/unit_test_runner.ts b/cli/tests/unit/unit_test_runner.ts
index 35a691ebd..1f347ec9a 100755
--- a/cli/tests/unit/unit_test_runner.ts
+++ b/cli/tests/unit/unit_test_runner.ts
@@ -97,6 +97,7 @@ function spawnWorkerRunner(
     Deno.execPath(),
     "run",
     "--unstable", // TODO(ry) be able to test stable vs unstable
+    "--location=http://js-unit-tests/foo/bar",
     "-A",
     "cli/tests/unit/unit_test_runner.ts",
     "--worker",
diff --git a/cli/tests/workers_test.ts b/cli/tests/workers_test.ts
index c35ea72f5..9cbc864bd 100644
--- a/cli/tests/workers_test.ts
+++ b/cli/tests/workers_test.ts
@@ -614,3 +614,41 @@ Deno.test("Worker with disabled permissions", async function () {
   await promise;
   worker.terminate();
 });
+
+Deno.test({
+  name: "worker location",
+  fn: async function (): Promise<void> {
+    const promise = deferred();
+    const workerModuleHref =
+      new URL("subdir/worker_location.ts", import.meta.url).href;
+    const w = new Worker(workerModuleHref, { type: "module" });
+    w.onmessage = (e): void => {
+      assertEquals(e.data, workerModuleHref);
+      promise.resolve();
+    };
+    w.postMessage("Hello, world!");
+    await promise;
+    w.terminate();
+  },
+});
+
+Deno.test({
+  name: "worker with relative specifier",
+  fn: async function (): Promise<void> {
+    // TODO(nayeemrmn): Add `Location` and `location` to `dlint`'s globals.
+    // deno-lint-ignore no-undef
+    assertEquals(location.href, "http://127.0.0.1:4545/cli/tests/");
+    const promise = deferred();
+    const w = new Worker(
+      "./workers/test_worker.ts",
+      { type: "module", name: "tsWorker" },
+    );
+    w.onmessage = (e): void => {
+      assertEquals(e.data, "Hello, world!");
+      promise.resolve();
+    };
+    w.postMessage("Hello, world!");
+    await promise;
+    w.terminate();
+  },
+});
diff --git a/cli/tools/installer.rs b/cli/tools/installer.rs
index f6eb33112..e04763172 100644
--- a/cli/tools/installer.rs
+++ b/cli/tools/installer.rs
@@ -202,6 +202,10 @@ pub fn install(
 
   let mut executable_args = vec!["run".to_string()];
   executable_args.extend_from_slice(&flags.to_permission_args());
+  if let Some(url) = flags.location.as_ref() {
+    executable_args.push("--location".to_string());
+    executable_args.push(url.to_string());
+  }
   if let Some(ca_file) = flags.ca_file {
     executable_args.push("--cert".to_string());
     executable_args.push(ca_file)