run() -> main() (#548)

* [433] remove old run function

* Completes run() -> main() transitions

src/about.md

@@ -107,9 +107,7 @@ Since these recipes are intended to be reused as-is and encourage best
 practices, they set up error handling correctly when there are
 `Result` types involved.
 
-The basic pattern we use is to have a `fn run() -> Result` that acts
+The basic pattern we use is to have a `fn main() -> Result`.
-like the "real" main function. We use the [error-chain] crate to make
-`?` work within `run`.
 
 The structure generally looks like:
 
@@ -127,7 +125,7 @@ error_chain! {
     }
 }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let bytes = b"2001:db8::1";
 
     // Bytes to string.
@@ -140,14 +138,12 @@ fn run() -> Result<()> {
     Ok(())
 }
 
-quick_main!(run);
 ```
 
 This is using the `error_chain!` macro to define a custom `Error` and
 `Result` type, along with automatic conversions from two standard
 library error types. The automatic conversions make the `?` operator
-work. The `quick_main!` macro generates the actual `main` function and
+work.
-prints out the error if one occurred.
 
 For the sake of readability error handling boilerplate is hidden by
 default like below.  In order to read full contents click on the
@@ -167,14 +163,12 @@ use url::{Url, Position};
 #     }
 # }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let parsed = Url::parse("https://httpbin.org/cookies/set?k2=v2&k1=v1")?;
     let cleaned: &str = &parsed[..Position::AfterPath];
     println!("cleaned: {}", cleaned);
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 For more background on error handling in Rust, read [this page of the

src/concurrency/parallel/rayon-thumbnails.md

@@ -31,7 +31,7 @@ use rayon::prelude::*;
 #     }
 # }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let options: MatchOptions = Default::default();
     let files: Vec<_> = glob_with("*.jpg", &options)?
         .filter_map(|x| x.ok())
@@ -72,8 +72,6 @@ where
     Ok(img.resize(longest_edge, longest_edge, FilterType::Nearest)
         .save(file_path)?)
 }
-#
-# quick_main!(run);
 ```
 
 [`glob::glob_with`]: https://docs.rs/glob/*/glob/fn.glob_with.html

src/concurrency/thread/global-mut-state.md

@@ -29,7 +29,7 @@ fn insert(fruit: &str) -> Result<()> {
     Ok(())
 }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     insert("apple")?;
     insert("orange")?;
     insert("peach")?;
@@ -41,8 +41,6 @@ fn run() -> Result<()> {
     insert("grape")?;
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 [`Mutex`]: https://doc.rust-lang.org/std/sync/struct.Mutex.html

src/concurrency/thread/threadpool-fractal.md

@@ -88,7 +88,7 @@ use image::{ImageBuffer, Pixel, Rgb};
 #     ((color * factor).powf(0.8) * 255.) as u8
 # }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let (width, height) = (1920, 1080);
     let mut img = ImageBuffer::new(width, height);
     let iterations = 300;
@@ -114,8 +114,6 @@ fn run() -> Result<()> {
     let _ = img.save("output.png")?;
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 [`ImageBuffer::new`]: https://docs.rs/image/*/image/struct.ImageBuffer.html#method.new

src/cryptography/hashing/sha-digest.md

@@ -38,7 +38,7 @@ fn sha256_digest<R: Read>(mut reader: R) -> Result<Digest> {
     Ok(context.finish())
 }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let path = "file.txt";
 
     let mut output = File::create(path)?;
@@ -52,8 +52,6 @@ fn run() -> Result<()> {
 
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 [`digest::Context`]: https://briansmith.org/rustdoc/ring/digest/struct.Context.html

src/development_tools/build_tools/cc-bundled-static.md

@@ -83,15 +83,13 @@ extern {
     fn greet(name: *const c_char);
 }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     unsafe { hello() }
     let name = prompt("What's your name? ")?;
     let c_name = CString::new(name)?;
     unsafe { greet(c_name.as_ptr()) }
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 [`cc::Build::define`]: https://docs.rs/cc/*/cc/struct.Build.html#method.define

src/development_tools/debugging/config_log/log-custom.md

@@ -31,7 +31,7 @@ use log4rs::config::{Appender, Config, Root};
 #     }
 # }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let logfile = FileAppender::builder()
         .encoder(Box::new(PatternEncoder::new("{l} - {m}\n")))
         .build("log/output.log")?;
@@ -48,8 +48,6 @@ fn run() -> Result<()> {
 
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 [`log4rs::append::file::FileAppender`]: https://docs.rs/log4rs/*/log4rs/append/file/struct.FileAppender.html

src/development_tools/versioning/semver-command.md

@@ -24,7 +24,7 @@ use semver::{Version, VersionReq};
 #     }
 # }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let version_constraint = "> 1.12.0";
     let version_test = VersionReq::parse(version_constraint)?;
     let output = Command::new("git").arg("--version").output()?;
@@ -46,8 +46,6 @@ fn run() -> Result<()> {
 
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 [`Command`]: https://doc.rust-lang.org/std/process/struct.Command.html

src/development_tools/versioning/semver-latest.md

@@ -35,7 +35,7 @@ where
     )
 }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     assert_eq!(
         find_max_matching_version("<= 1.0.0", vec!["0.9.0", "1.0.0", "1.0.1"])?,
         Some(Version::parse("1.0.0")?)
@@ -57,8 +57,6 @@ fn run() -> Result<()> {
 
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 [`semver::Version`]: https://docs.rs/semver/*/semver/struct.Version.html

src/encoding/complex/toml.md

@@ -61,7 +61,7 @@ struct Package {
 #     }
 # }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let toml_content = r#"
           [package]
           name = "your_package"
@@ -81,6 +81,4 @@ fn run() -> Result<()> {
 
     Ok(())
 }
-#
-# quick_main!(run);
 ```

src/encoding/csv/filter.md

@@ -18,7 +18,7 @@ use std::io;
 #     }
 # }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let query = "CA";
     let data = "\
 City,State,Population,Latitude,Longitude
@@ -42,8 +42,6 @@ West Hollywood,CA,37031,34.0900000,-118.3608333";
     wtr.flush()?;
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 _Disclaimer: this example has been adapted from [the csv crate tutorial](https://docs.rs/csv/*/csv/tutorial/index.html#filter-by-search)_.

src/encoding/csv/read.md

@@ -55,7 +55,7 @@ struct Record {
     description: String,
 }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let csv = "year,make,model,description
 1948,Porsche,356,Luxury sports car
 1967,Ford,Mustang fastback 1967,American car";
@@ -75,8 +75,6 @@ fn run() -> Result<()> {
 
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 [`csv::ByteRecord`]: https://docs.rs/csv/*/csv/struct.ByteRecord.html

src/encoding/csv/serde-serialize.md

@@ -28,7 +28,7 @@ struct Record<'a> {
     id: u64,
 }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let mut wtr = csv::Writer::from_writer(io::stdout());
 
     let rec1 = Record { name: "Mark", place: "Melbourne", id: 56};
@@ -43,6 +43,4 @@ fn run() -> Result<()> {
 
     Ok(())
 }
-#
-# quick_main!(run);
 ```

src/encoding/csv/serialize.md

@@ -22,7 +22,7 @@ use std::io;
 #    }
 # }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let mut wtr = csv::Writer::from_writer(io::stdout());
 
     wtr.write_record(&["Name", "Place", "ID"])?;
@@ -34,8 +34,6 @@ fn run() -> Result<()> {
     wtr.flush()?;
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 [`csv::Writer`]: https://docs.rs/csv/*/csv/struct.Writer.html

src/encoding/csv/transform.md

@@ -70,7 +70,7 @@ impl<'de> Deserialize<'de> for HexColor {
     }
 }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let data = "color_name,color
 red,#ff0000
 green,#00ff00
@@ -94,8 +94,6 @@ magenta,#ff00ff"
     println!("{}", written);
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 [`csv::Reader::deserialize`]: https://docs.rs/csv/\*/csv/struct.Reader.html#method.deserialize

src/encoding/string/base64.md

@@ -20,7 +20,7 @@ use base64::{encode, decode};
 #     }
 # }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let hello = b"hello rustaceans";
     let encoded = encode(hello);
     let decoded = decode(&encoded)?;
@@ -31,8 +31,6 @@ fn run() -> Result<()> {
 
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 [`decode`]: https://docs.rs/base64/*/base64/fn.decode.html

src/file/dir/find-file.md

@@ -21,7 +21,7 @@ use walkdir::WalkDir;
 #     }
 # }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     for entry in WalkDir::new(".")
             .follow_links(true)
             .into_iter()
@@ -36,8 +36,6 @@ fn run() -> Result<()> {
 
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 [`follow_links`]: https://docs.rs/walkdir/*/walkdir/struct.WalkDir.html#method.follow_links

src/file/dir/ignore-case.md

@@ -20,7 +20,7 @@ use glob::{glob_with, MatchOptions};
 #     }
 # }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let options = MatchOptions {
         case_sensitive: false,
         ..Default::default()
@@ -32,8 +32,6 @@ fn run() -> Result<()> {
 
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 [`Default`]: https://doc.rust-lang.org/std/default/trait.Default.html

src/file/dir/modified.md

@@ -23,7 +23,7 @@ use std::{env, fs};
 #     }
 # }
 #
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let current_dir = env::current_dir()?;
     println!(
         "Entries modified in the last 24 hours in {:?}:",
@@ -50,8 +50,6 @@ fn run() -> Result<()> {
 
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 [`DirEntry::path`]: https://doc.rust-lang.org/std/fs/struct.DirEntry.html#method.path

src/file/dir/png.md

@@ -22,13 +22,11 @@ use glob::glob;
 #     }
 # }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     for entry in glob("**/*.png")? {
         println!("{}", entry?.display());
     }
 
     Ok(())
 }
-#
-# quick_main!(run);
 ```

src/os/external/piped.md

@@ -22,7 +22,7 @@ use std::process::{Command, Stdio};
 #     }
 # }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let directory = std::env::current_dir()?;
     let mut du_output_child = Command::new("du")
         .arg("-ah")
@@ -60,8 +60,6 @@ fn run() -> Result<()> {
 
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 [`Command`]: https://doc.rust-lang.org/std/process/struct.Command.html

src/os/external/process-output.md

@@ -27,7 +27,7 @@ struct Commit {
     message: String,
 }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let output = Command::new("git").arg("log").arg("--oneline").output()?;
 
     if !output.status.success() {
@@ -52,8 +52,6 @@ fn run() -> Result<()> {
 
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 [`Command`]: https://doc.rust-lang.org/std/process/struct.Command.html

src/os/external/send-input.md

@@ -21,7 +21,7 @@ use std::process::{Command, Stdio};
 #     }
 # }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let mut child = Command::new("python").stdin(Stdio::piped())
         .stderr(Stdio::piped())
         .stdout(Stdio::piped())
@@ -47,8 +47,6 @@ fn run() -> Result<()> {
         bail!("External command failed:\n {}", err)
     }
 }
-#
-# quick_main!(run);
 ```
 
 [`Command`]: https://doc.rust-lang.org/std/process/struct.Command.html

src/text/regex/filter-log.md

@@ -26,7 +26,7 @@ use regex::RegexSetBuilder;
 #     }
 # }
 #
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let log_path = "application.log";
     let buffered = BufReader::new(File::open(log_path)?);
 
@@ -45,8 +45,6 @@ fn run() -> Result<()> {
 
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 [`regex::RegexSet`]: https://docs.rs/regex/*/regex/struct.RegexSet.html

src/text/regex/phone.md

@@ -32,7 +32,7 @@ impl<'a> fmt::Display for PhoneNumber<'a> {
     }
 }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let phone_text = "
     +1 505 881 9292 (v) +1 505 778 2212 (c) +1 505 881 9297 (f)
     (202) 991 9534
@@ -78,8 +78,6 @@ fn run() -> Result<()> {
 
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 [`Regex::captures_iter`]: https://docs.rs/regex/*/regex/struct.Regex.html#method.captures_iter

src/web/clients/api/rate-limited.md

@@ -30,43 +30,42 @@ header! { (XRateLimitLimit, "X-RateLimit-Limit") => [usize] }
 header! { (XRateLimitRemaining, "X-RateLimit-Remaining") => [usize] }
 header! { (XRateLimitReset, "X-RateLimit-Reset") => [u64] }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
-    let url = "https://api.github.com/users/rust-lang-nursery ";
+    loop {
-    let client = reqwest::Client::new();
+        let url = "https://api.github.com/users/rust-lang-nursery ";
-    let response = client.get(url).send()?;
+        let client = reqwest::Client::new();
+        let response = client.get(url).send()?;
 
-    let rate_limit = response.headers().get::<XRateLimitLimit>().ok_or(
+        let rate_limit = response.headers().get::<XRateLimitLimit>().ok_or(
-        "response doesn't include the expected X-RateLimit-Limit header",
+            "response doesn't include the expected X-RateLimit-Limit header",
-    )?;
+        )?;
 
-    let rate_remaining = response.headers().get::<XRateLimitRemaining>().ok_or(
+        let rate_remaining = response.headers().get::<XRateLimitRemaining>().ok_or(
-        "response doesn't include the expected X-RateLimit-Remaining header",
+            "response doesn't include the expected X-RateLimit-Remaining header",
-    )?;
+        )?;
 
-    let rate_reset_at = response.headers().get::<XRateLimitReset>().ok_or(
+        let rate_reset_at = response.headers().get::<XRateLimitReset>().ok_or(
-        "response doesn't include the expected X-RateLimit-Reset header",
+            "response doesn't include the expected X-RateLimit-Reset header",
-    )?;
+        )?;
 
-    let rate_reset_within = Duration::from_secs(**rate_reset_at) - UNIX_EPOCH.elapsed()?;
+        let rate_reset_within = Duration::from_secs(**rate_reset_at) - UNIX_EPOCH.elapsed()?;
 
-    if response.status() == StatusCode::Forbidden && **rate_remaining == 0 {
+        if response.status() == StatusCode::Forbidden && **rate_remaining == 0 {
-        println!("Sleeping for {} seconds.", rate_reset_within.as_secs());
+            println!("Sleeping for {} seconds.", rate_reset_within.as_secs());
-        thread::sleep(rate_reset_within);
+            thread::sleep(rate_reset_within);
-        return run();
+            return main();
+        } else {
+            println!(
+                "Rate limit is currently {}/{}, the reset of this limit will be within {} seconds.",
+                **rate_remaining,
+                **rate_limit,
+                rate_reset_within.as_secs(),
+            );
+            break;
+        }
     }
-    else {
-        println!(
-            "Rate limit is currently {}/{}, the reset of this limit will be within {} seconds.",
-            **rate_remaining,
-            **rate_limit,
-            rate_reset_within.as_secs(),
-        );
-    }
-
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 [`hyper::header!`]: https://doc.servo.org/hyper/header/index.html#defining-custom-headers

src/web/clients/api/rest-post.md

@@ -36,7 +36,7 @@ struct Gist {
     html_url: String,
 }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let gh_user = env::var("GH_USER")?;
     let gh_pass = env::var("GH_PASS")?;
 
@@ -68,8 +68,6 @@ fn run() -> Result<()> {
     println!("Gist {} deleted! Status code: {}",gist.id, response.status());
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 The example uses [HTTP Basic Auth] in order to authorize access to [GitHub API].

src/web/clients/download/basic.md

@@ -47,8 +47,6 @@ fn run() -> Result<()> {
     copy(&mut response, &mut dest)?;
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 [`File`]: https://doc.rust-lang.org/std/fs/struct.File.html

src/web/clients/download/partial.md

@@ -65,7 +65,7 @@ use reqwest::StatusCode;
 #     }
 # }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let url = "https://httpbin.org/range/102400?duration=2";
     const CHUNK_SIZE: u32 = 10240;
 
@@ -95,8 +95,6 @@ fn run() -> Result<()> {
     println!("Finished with success!");
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 [`reqwest::Client::get`]: https://docs.rs/reqwest/*/reqwest/struct.Client.html#method.get

src/web/clients/download/post-file.md

@@ -26,7 +26,7 @@ use reqwest::Client;
 #     }
 # }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let paste_api = "https://paste.rs";
     let file = File::open("message")?;
 
@@ -36,8 +36,6 @@ fn run() -> Result<()> {
     println!("Your paste is located at: {}", response_body);
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 [`Client::post`]: https://docs.rs/reqwest/*/reqwest/struct.Client.html#method.post

src/web/clients/requests/get.md

@@ -21,7 +21,7 @@ use std::io::Read;
 #     }
 # }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let mut res = reqwest::get("http://httpbin.org/get")?;
     let mut body = String::new();
     res.read_to_string(&mut body)?;
@@ -32,8 +32,6 @@ fn run() -> Result<()> {
 
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 [`read_to_string`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_to_string

src/web/clients/requests/header.md

@@ -43,7 +43,7 @@ pub struct HeadersEcho {
 #     }
 # }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let url = Url::parse_with_params("http://httpbin.org/headers",
                                      &[("lang", "rust"), ("browser", "servo")])?;
 
@@ -65,8 +65,6 @@ fn run() -> Result<()> {
     println!("{:?}", out);
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 [`header::Authorization`]: https://doc.servo.org/hyper/header/struct.Authorization.html

src/web/mime/request.md

@@ -30,7 +30,7 @@ use reqwest::header::CONTENT_TYPE;
 #    }
 # }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let response = reqwest::get("https://www.rust-lang.org/logos/rust-logo-32x32.png")?;
     let headers = response.headers();
 
@@ -54,8 +54,6 @@ fn run() -> Result<()> {
 
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 [`http`]: https://docs.rs/http/*/http/

src/web/scraping/broken.md

@@ -49,7 +49,7 @@ fn check_link(url: &Url) -> Result<bool> {
     Ok(res.status() != StatusCode::NOT_FOUND)
 }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let url = Url::parse("https://www.rust-lang.org/en-US/")?;
 
     let res = reqwest::get(url.as_ref())?;
@@ -72,8 +72,6 @@ fn run() -> Result<()> {
 
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 [`attr`]: https://docs.rs/select/*/select/node/struct.Node.html#method.attr

src/web/scraping/extract-links.md

@@ -24,7 +24,7 @@ use select::predicate::Name;
 #    }
 # }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let res = reqwest::get("https://www.rust-lang.org/en-US/")?;
 
     Document::from_read(res)?
@@ -34,8 +34,6 @@ fn run() -> Result<()> {
 
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 [`attr`]: https://docs.rs/select/*/select/node/struct.Node.html#method.attr

src/web/scraping/unique.md

@@ -51,7 +51,7 @@ fn extract_links(content: &str) -> Result<HashSet<Cow<str>>> {
     Ok(links)
 }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let mut content = String::new();
     reqwest::get(
         "https://en.wikipedia.org/w/index.php?title=Rust_(programming_language)&action=raw",
@@ -62,8 +62,6 @@ fn run() -> Result<()> {
 
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 [`Cow`]: https://doc.rust-lang.org/std/borrow/enum.Cow.html

src/web/url/base.md

@@ -23,7 +23,7 @@ use url::Url;
 #     }
 # }
 
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let full = "https://github.com/rust-lang/cargo?asdf";
 
     let url = Url::parse(full)?;
@@ -49,8 +49,6 @@ fn base_url(mut url: Url) -> Result<Url> {
 
     Ok(url)
 }
-#
-# quick_main!(run);
 ```
 
 [`PathSegmentsMut::clear`]: https://docs.rs/url/*/url/struct.PathSegmentsMut.html#method.clear

src/web/url/origin.md

@@ -39,7 +39,7 @@ use url::{Url, Origin, Host};
 #     }
 # }
 #
-fn run() -> Result<()> {
+fn main() -> Result<()> {
     let s = "ftp://rust-lang.org/examples";
 
     let url = Url::parse(s)?;
@@ -55,8 +55,6 @@ fn run() -> Result<()> {
 
     Ok(())
 }
-#
-# quick_main!(run);
 ```
 
 [`origin`]: https://docs.rs/url/*/url/struct.Url.html#method.origin