http/
status.rs

1//! HTTP status codes
2//!
3//! This module contains HTTP-status code related structs and errors. The main
4//! type in this module is `StatusCode` which is not intended to be used through
5//! this module but rather the `http::StatusCode` type.
6//!
7//! # Examples
8//!
9//! ```
10//! use http::StatusCode;
11//!
12//! assert_eq!(StatusCode::from_u16(200).unwrap(), StatusCode::OK);
13//! assert_eq!(StatusCode::NOT_FOUND, 404);
14//! assert!(StatusCode::OK.is_success());
15//! ```
16
17use std::convert::TryFrom;
18use std::error::Error;
19use std::fmt;
20use std::num::NonZeroU16;
21use std::str::FromStr;
22
23/// An HTTP status code (`status-code` in RFC 9110 et al.).
24///
25/// Constants are provided for known status codes, including those in the IANA
26/// [HTTP Status Code Registry](
27/// https://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml).
28///
29/// Status code values in the range 100-999 (inclusive) are supported by this
30/// type. Values in the range 100-599 are semantically classified by the most
31/// significant digit. See [`StatusCode::is_success`], etc. Values above 599
32/// are unclassified but allowed for legacy compatibility, though their use is
33/// discouraged. Applications may interpret such values as protocol errors.
34///
35/// # Examples
36///
37/// ```
38/// use http::StatusCode;
39///
40/// assert_eq!(StatusCode::from_u16(200).unwrap(), StatusCode::OK);
41/// assert_eq!(StatusCode::NOT_FOUND.as_u16(), 404);
42/// assert!(StatusCode::OK.is_success());
43/// ```
44#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
45pub struct StatusCode(NonZeroU16);
46
47/// A possible error value when converting a `StatusCode` from a `u16` or `&str`.
48///
49/// This error indicates that the supplied input was not a valid number, was less
50/// than 100, or was greater than 999.
51pub struct InvalidStatusCode {
52    _priv: (),
53}
54
55impl StatusCode {
56    /// Converts a u16 to a status code.
57    ///
58    /// The function validates the correctness of the supplied u16. It must be
59    /// greater or equal to 100 and less than 1000.
60    ///
61    /// # Example
62    ///
63    /// ```
64    /// use http::StatusCode;
65    ///
66    /// let ok = StatusCode::from_u16(200).unwrap();
67    /// assert_eq!(ok, StatusCode::OK);
68    ///
69    /// let err = StatusCode::from_u16(99);
70    /// assert!(err.is_err());
71    /// ```
72    #[inline]
73    pub const fn from_u16(src: u16) -> Result<StatusCode, InvalidStatusCode> {
74        if let 100..=999 = src {
75            if let Some(code) = NonZeroU16::new(src) {
76                return Ok(StatusCode(code));
77            }
78        }
79        Err(InvalidStatusCode::new())
80    }
81
82    /// Converts a `&[u8]` to a status code.
83    pub fn from_bytes(src: &[u8]) -> Result<StatusCode, InvalidStatusCode> {
84        if src.len() != 3 {
85            return Err(InvalidStatusCode::new());
86        }
87
88        let a = src[0].wrapping_sub(b'0') as u16;
89        let b = src[1].wrapping_sub(b'0') as u16;
90        let c = src[2].wrapping_sub(b'0') as u16;
91
92        if a == 0 || a > 9 || b > 9 || c > 9 {
93            return Err(InvalidStatusCode::new());
94        }
95
96        let status = (a * 100) + (b * 10) + c;
97        NonZeroU16::new(status)
98            .map(StatusCode)
99            .ok_or_else(InvalidStatusCode::new)
100    }
101
102    /// Returns the `u16` corresponding to this `StatusCode`.
103    ///
104    /// # Note
105    ///
106    /// This is the same as the `From<StatusCode>` implementation, but
107    /// included as an inherent method because that implementation doesn't
108    /// appear in rustdocs, as well as a way to force the type instead of
109    /// relying on inference.
110    ///
111    /// # Example
112    ///
113    /// ```
114    /// let status = http::StatusCode::OK;
115    /// assert_eq!(status.as_u16(), 200);
116    /// ```
117    #[inline]
118    pub const fn as_u16(&self) -> u16 {
119        self.0.get()
120    }
121
122    /// Returns a &str representation of the `StatusCode`
123    ///
124    /// The return value only includes a numerical representation of the
125    /// status code. The canonical reason is not included.
126    ///
127    /// # Example
128    ///
129    /// ```
130    /// let status = http::StatusCode::OK;
131    /// assert_eq!(status.as_str(), "200");
132    /// ```
133    #[inline]
134    pub fn as_str(&self) -> &str {
135        let offset = (self.0.get() - 100) as usize;
136        let offset = offset * 3;
137
138        // Invariant: self has checked range [100, 999] and CODE_DIGITS is
139        // ASCII-only, of length 900 * 3 = 2700 bytes
140
141        #[cfg(debug_assertions)]
142        {
143            &CODE_DIGITS[offset..offset + 3]
144        }
145
146        #[cfg(not(debug_assertions))]
147        unsafe {
148            CODE_DIGITS.get_unchecked(offset..offset + 3)
149        }
150    }
151
152    /// Get the standardised `reason-phrase` for this status code.
153    ///
154    /// This is mostly here for servers writing responses, but could potentially have application
155    /// at other times.
156    ///
157    /// The reason phrase is defined as being exclusively for human readers. You should avoid
158    /// deriving any meaning from it at all costs.
159    ///
160    /// Bear in mind also that in HTTP/2.0 and HTTP/3.0 the reason phrase is abolished from
161    /// transmission, and so this canonical reason phrase really is the only reason phrase you’ll
162    /// find.
163    ///
164    /// # Example
165    ///
166    /// ```
167    /// let status = http::StatusCode::OK;
168    /// assert_eq!(status.canonical_reason(), Some("OK"));
169    /// ```
170    pub fn canonical_reason(&self) -> Option<&'static str> {
171        canonical_reason(self.0.get())
172    }
173
174    /// Check if status is within 100-199.
175    #[inline]
176    pub fn is_informational(&self) -> bool {
177        (100..200).contains(&self.0.get())
178    }
179
180    /// Check if status is within 200-299.
181    #[inline]
182    pub fn is_success(&self) -> bool {
183        (200..300).contains(&self.0.get())
184    }
185
186    /// Check if status is within 300-399.
187    #[inline]
188    pub fn is_redirection(&self) -> bool {
189        (300..400).contains(&self.0.get())
190    }
191
192    /// Check if status is within 400-499.
193    #[inline]
194    pub fn is_client_error(&self) -> bool {
195        (400..500).contains(&self.0.get())
196    }
197
198    /// Check if status is within 500-599.
199    #[inline]
200    pub fn is_server_error(&self) -> bool {
201        (500..600).contains(&self.0.get())
202    }
203}
204
205impl fmt::Debug for StatusCode {
206    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
207        fmt::Debug::fmt(&self.0, f)
208    }
209}
210
211/// Formats the status code, *including* the canonical reason.
212///
213/// # Example
214///
215/// ```
216/// # use http::StatusCode;
217/// assert_eq!(format!("{}", StatusCode::OK), "200 OK");
218/// ```
219impl fmt::Display for StatusCode {
220    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
221        write!(
222            f,
223            "{} {}",
224            u16::from(*self),
225            self.canonical_reason().unwrap_or("<unknown status code>")
226        )
227    }
228}
229
230impl Default for StatusCode {
231    #[inline]
232    fn default() -> StatusCode {
233        StatusCode::OK
234    }
235}
236
237impl PartialEq<u16> for StatusCode {
238    #[inline]
239    fn eq(&self, other: &u16) -> bool {
240        self.as_u16() == *other
241    }
242}
243
244impl PartialEq<StatusCode> for u16 {
245    #[inline]
246    fn eq(&self, other: &StatusCode) -> bool {
247        *self == other.as_u16()
248    }
249}
250
251impl From<StatusCode> for u16 {
252    #[inline]
253    fn from(status: StatusCode) -> u16 {
254        status.0.get()
255    }
256}
257
258impl FromStr for StatusCode {
259    type Err = InvalidStatusCode;
260
261    fn from_str(s: &str) -> Result<StatusCode, InvalidStatusCode> {
262        StatusCode::from_bytes(s.as_ref())
263    }
264}
265
266impl<'a> From<&'a StatusCode> for StatusCode {
267    #[inline]
268    fn from(t: &'a StatusCode) -> Self {
269        t.to_owned()
270    }
271}
272
273impl<'a> TryFrom<&'a [u8]> for StatusCode {
274    type Error = InvalidStatusCode;
275
276    #[inline]
277    fn try_from(t: &'a [u8]) -> Result<Self, Self::Error> {
278        StatusCode::from_bytes(t)
279    }
280}
281
282impl<'a> TryFrom<&'a str> for StatusCode {
283    type Error = InvalidStatusCode;
284
285    #[inline]
286    fn try_from(t: &'a str) -> Result<Self, Self::Error> {
287        t.parse()
288    }
289}
290
291impl TryFrom<u16> for StatusCode {
292    type Error = InvalidStatusCode;
293
294    #[inline]
295    fn try_from(t: u16) -> Result<Self, Self::Error> {
296        StatusCode::from_u16(t)
297    }
298}
299
300macro_rules! status_codes {
301    (
302        $(
303            $(#[$docs:meta])*
304            ($num:expr, $konst:ident, $phrase:expr);
305        )+
306    ) => {
307        impl StatusCode {
308        $(
309            $(#[$docs])*
310            pub const $konst: StatusCode = StatusCode(unsafe { NonZeroU16::new_unchecked($num) });
311        )+
312
313        }
314
315        fn canonical_reason(num: u16) -> Option<&'static str> {
316            match num {
317                $(
318                $num => Some($phrase),
319                )+
320                _ => None
321            }
322        }
323    }
324}
325
326status_codes! {
327    /// 100 Continue
328    /// [[RFC9110, Section 15.2.1](https://datatracker.ietf.org/doc/html/rfc9110#section-15.2.1)]
329    (100, CONTINUE, "Continue");
330    /// 101 Switching Protocols
331    /// [[RFC9110, Section 15.2.2](https://datatracker.ietf.org/doc/html/rfc9110#section-15.2.2)]
332    (101, SWITCHING_PROTOCOLS, "Switching Protocols");
333    /// 102 Processing
334    /// [[RFC2518, Section 10.1](https://datatracker.ietf.org/doc/html/rfc2518#section-10.1)]
335    (102, PROCESSING, "Processing");
336    /// 103 Early Hints
337    /// [[RFC8297, Section 2](https://datatracker.ietf.org/doc/html/rfc8297#section-2)]
338    (103, EARLY_HINTS, "Early Hints");
339
340    /// 200 OK
341    /// [[RFC9110, Section 15.3.1](https://datatracker.ietf.org/doc/html/rfc9110#section-15.3.1)]
342    (200, OK, "OK");
343    /// 201 Created
344    /// [[RFC9110, Section 15.3.2](https://datatracker.ietf.org/doc/html/rfc9110#section-15.3.2)]
345    (201, CREATED, "Created");
346    /// 202 Accepted
347    /// [[RFC9110, Section 15.3.3](https://datatracker.ietf.org/doc/html/rfc9110#section-15.3.3)]
348    (202, ACCEPTED, "Accepted");
349    /// 203 Non-Authoritative Information
350    /// [[RFC9110, Section 15.3.4](https://datatracker.ietf.org/doc/html/rfc9110#section-15.3.4)]
351    (203, NON_AUTHORITATIVE_INFORMATION, "Non Authoritative Information");
352    /// 204 No Content
353    /// [[RFC9110, Section 15.3.5](https://datatracker.ietf.org/doc/html/rfc9110#section-15.3.5)]
354    (204, NO_CONTENT, "No Content");
355    /// 205 Reset Content
356    /// [[RFC9110, Section 15.3.6](https://datatracker.ietf.org/doc/html/rfc9110#section-15.3.6)]
357    (205, RESET_CONTENT, "Reset Content");
358    /// 206 Partial Content
359    /// [[RFC9110, Section 15.3.7](https://datatracker.ietf.org/doc/html/rfc9110#section-15.3.7)]
360    (206, PARTIAL_CONTENT, "Partial Content");
361    /// 207 Multi-Status
362    /// [[RFC4918, Section 11.1](https://datatracker.ietf.org/doc/html/rfc4918#section-11.1)]
363    (207, MULTI_STATUS, "Multi-Status");
364    /// 208 Already Reported
365    /// [[RFC5842, Section 7.1](https://datatracker.ietf.org/doc/html/rfc5842#section-7.1)]
366    (208, ALREADY_REPORTED, "Already Reported");
367
368    /// 226 IM Used
369    /// [[RFC3229, Section 10.4.1](https://datatracker.ietf.org/doc/html/rfc3229#section-10.4.1)]
370    (226, IM_USED, "IM Used");
371
372    /// 300 Multiple Choices
373    /// [[RFC9110, Section 15.4.1](https://datatracker.ietf.org/doc/html/rfc9110#section-15.4.1)]
374    (300, MULTIPLE_CHOICES, "Multiple Choices");
375    /// 301 Moved Permanently
376    /// [[RFC9110, Section 15.4.2](https://datatracker.ietf.org/doc/html/rfc9110#section-15.4.2)]
377    (301, MOVED_PERMANENTLY, "Moved Permanently");
378    /// 302 Found
379    /// [[RFC9110, Section 15.4.3](https://datatracker.ietf.org/doc/html/rfc9110#section-15.4.3)]
380    (302, FOUND, "Found");
381    /// 303 See Other
382    /// [[RFC9110, Section 15.4.4](https://datatracker.ietf.org/doc/html/rfc9110#section-15.4.4)]
383    (303, SEE_OTHER, "See Other");
384    /// 304 Not Modified
385    /// [[RFC9110, Section 15.4.5](https://datatracker.ietf.org/doc/html/rfc9110#section-15.4.5)]
386    (304, NOT_MODIFIED, "Not Modified");
387    /// 305 Use Proxy
388    /// [[RFC9110, Section 15.4.6](https://datatracker.ietf.org/doc/html/rfc9110#section-15.4.6)]
389    (305, USE_PROXY, "Use Proxy");
390    /// 307 Temporary Redirect
391    /// [[RFC9110, Section 15.4.7](https://datatracker.ietf.org/doc/html/rfc9110#section-15.4.7)]
392    (307, TEMPORARY_REDIRECT, "Temporary Redirect");
393    /// 308 Permanent Redirect
394    /// [[RFC9110, Section 15.4.8](https://datatracker.ietf.org/doc/html/rfc9110#section-15.4.8)]
395    (308, PERMANENT_REDIRECT, "Permanent Redirect");
396
397    /// 400 Bad Request
398    /// [[RFC9110, Section 15.5.1](https://datatracker.ietf.org/doc/html/rfc9110#section-15.5.1)]
399    (400, BAD_REQUEST, "Bad Request");
400    /// 401 Unauthorized
401    /// [[RFC9110, Section 15.5.2](https://datatracker.ietf.org/doc/html/rfc9110#section-15.5.2)]
402    (401, UNAUTHORIZED, "Unauthorized");
403    /// 402 Payment Required
404    /// [[RFC9110, Section 15.5.3](https://datatracker.ietf.org/doc/html/rfc9110#section-15.5.3)]
405    (402, PAYMENT_REQUIRED, "Payment Required");
406    /// 403 Forbidden
407    /// [[RFC9110, Section 15.5.4](https://datatracker.ietf.org/doc/html/rfc9110#section-15.5.4)]
408    (403, FORBIDDEN, "Forbidden");
409    /// 404 Not Found
410    /// [[RFC9110, Section 15.5.5](https://datatracker.ietf.org/doc/html/rfc9110#section-15.5.5)]
411    (404, NOT_FOUND, "Not Found");
412    /// 405 Method Not Allowed
413    /// [[RFC9110, Section 15.5.6](https://datatracker.ietf.org/doc/html/rfc9110#section-15.5.6)]
414    (405, METHOD_NOT_ALLOWED, "Method Not Allowed");
415    /// 406 Not Acceptable
416    /// [[RFC9110, Section 15.5.7](https://datatracker.ietf.org/doc/html/rfc9110#section-15.5.7)]
417    (406, NOT_ACCEPTABLE, "Not Acceptable");
418    /// 407 Proxy Authentication Required
419    /// [[RFC9110, Section 15.5.8](https://datatracker.ietf.org/doc/html/rfc9110#section-15.5.8)]
420    (407, PROXY_AUTHENTICATION_REQUIRED, "Proxy Authentication Required");
421    /// 408 Request Timeout
422    /// [[RFC9110, Section 15.5.9](https://datatracker.ietf.org/doc/html/rfc9110#section-15.5.9)]
423    (408, REQUEST_TIMEOUT, "Request Timeout");
424    /// 409 Conflict
425    /// [[RFC9110, Section 15.5.10](https://datatracker.ietf.org/doc/html/rfc9110#section-15.5.10)]
426    (409, CONFLICT, "Conflict");
427    /// 410 Gone
428    /// [[RFC9110, Section 15.5.11](https://datatracker.ietf.org/doc/html/rfc9110#section-15.5.11)]
429    (410, GONE, "Gone");
430    /// 411 Length Required
431    /// [[RFC9110, Section 15.5.12](https://datatracker.ietf.org/doc/html/rfc9110#section-15.5.12)]
432    (411, LENGTH_REQUIRED, "Length Required");
433    /// 412 Precondition Failed
434    /// [[RFC9110, Section 15.5.13](https://datatracker.ietf.org/doc/html/rfc9110#section-15.5.13)]
435    (412, PRECONDITION_FAILED, "Precondition Failed");
436    /// 413 Payload Too Large
437    /// [[RFC9110, Section 15.5.14](https://datatracker.ietf.org/doc/html/rfc9110#section-15.5.14)]
438    (413, PAYLOAD_TOO_LARGE, "Payload Too Large");
439    /// 414 URI Too Long
440    /// [[RFC9110, Section 15.5.15](https://datatracker.ietf.org/doc/html/rfc9110#section-15.5.15)]
441    (414, URI_TOO_LONG, "URI Too Long");
442    /// 415 Unsupported Media Type
443    /// [[RFC9110, Section 15.5.16](https://datatracker.ietf.org/doc/html/rfc9110#section-15.5.16)]
444    (415, UNSUPPORTED_MEDIA_TYPE, "Unsupported Media Type");
445    /// 416 Range Not Satisfiable
446    /// [[RFC9110, Section 15.5.17](https://datatracker.ietf.org/doc/html/rfc9110#section-15.5.17)]
447    (416, RANGE_NOT_SATISFIABLE, "Range Not Satisfiable");
448    /// 417 Expectation Failed
449    /// [[RFC9110, Section 15.5.18](https://datatracker.ietf.org/doc/html/rfc9110#section-15.5.18)]
450    (417, EXPECTATION_FAILED, "Expectation Failed");
451    /// 418 I'm a teapot
452    /// [curiously not registered by IANA but [RFC2324, Section 2.3.2](https://datatracker.ietf.org/doc/html/rfc2324#section-2.3.2)]
453    (418, IM_A_TEAPOT, "I'm a teapot");
454
455    /// 421 Misdirected Request
456    /// [[RFC9110, Section 15.5.20](https://datatracker.ietf.org/doc/html/rfc9110#section-15.5.20)]
457    (421, MISDIRECTED_REQUEST, "Misdirected Request");
458    /// 422 Unprocessable Entity
459    /// [[RFC9110, Section 15.5.21](https://datatracker.ietf.org/doc/html/rfc9110#section-15.5.21)]
460    (422, UNPROCESSABLE_ENTITY, "Unprocessable Entity");
461    /// 423 Locked
462    /// [[RFC4918, Section 11.3](https://datatracker.ietf.org/doc/html/rfc4918#section-11.3)]
463    (423, LOCKED, "Locked");
464    /// 424 Failed Dependency
465    /// [[RFC4918, Section 11.4](https://tools.ietf.org/html/rfc4918#section-11.4)]
466    (424, FAILED_DEPENDENCY, "Failed Dependency");
467
468    /// 425 Too early
469    /// [[RFC8470, Section 5.2](https://httpwg.org/specs/rfc8470.html#status)]
470    (425, TOO_EARLY, "Too Early");
471
472    /// 426 Upgrade Required
473    /// [[RFC9110, Section 15.5.22](https://datatracker.ietf.org/doc/html/rfc9110#section-15.5.22)]
474    (426, UPGRADE_REQUIRED, "Upgrade Required");
475
476    /// 428 Precondition Required
477    /// [[RFC6585, Section 3](https://datatracker.ietf.org/doc/html/rfc6585#section-3)]
478    (428, PRECONDITION_REQUIRED, "Precondition Required");
479    /// 429 Too Many Requests
480    /// [[RFC6585, Section 4](https://datatracker.ietf.org/doc/html/rfc6585#section-4)]
481    (429, TOO_MANY_REQUESTS, "Too Many Requests");
482
483    /// 431 Request Header Fields Too Large
484    /// [[RFC6585, Section 5](https://datatracker.ietf.org/doc/html/rfc6585#section-5)]
485    (431, REQUEST_HEADER_FIELDS_TOO_LARGE, "Request Header Fields Too Large");
486
487    /// 451 Unavailable For Legal Reasons
488    /// [[RFC7725, Section 3](https://tools.ietf.org/html/rfc7725#section-3)]
489    (451, UNAVAILABLE_FOR_LEGAL_REASONS, "Unavailable For Legal Reasons");
490
491    /// 500 Internal Server Error
492    /// [[RFC9110, Section 15.6.1](https://datatracker.ietf.org/doc/html/rfc9110#section-15.6.1)]
493    (500, INTERNAL_SERVER_ERROR, "Internal Server Error");
494    /// 501 Not Implemented
495    /// [[RFC9110, Section 15.6.2](https://datatracker.ietf.org/doc/html/rfc9110#section-15.6.2)]
496    (501, NOT_IMPLEMENTED, "Not Implemented");
497    /// 502 Bad Gateway
498    /// [[RFC9110, Section 15.6.3](https://datatracker.ietf.org/doc/html/rfc9110#section-15.6.3)]
499    (502, BAD_GATEWAY, "Bad Gateway");
500    /// 503 Service Unavailable
501    /// [[RFC9110, Section 15.6.4](https://datatracker.ietf.org/doc/html/rfc9110#section-15.6.4)]
502    (503, SERVICE_UNAVAILABLE, "Service Unavailable");
503    /// 504 Gateway Timeout
504    /// [[RFC9110, Section 15.6.5](https://datatracker.ietf.org/doc/html/rfc9110#section-15.6.5)]
505    (504, GATEWAY_TIMEOUT, "Gateway Timeout");
506    /// 505 HTTP Version Not Supported
507    /// [[RFC9110, Section 15.6.6](https://datatracker.ietf.org/doc/html/rfc9110#section-15.6.6)]
508    (505, HTTP_VERSION_NOT_SUPPORTED, "HTTP Version Not Supported");
509    /// 506 Variant Also Negotiates
510    /// [[RFC2295, Section 8.1](https://datatracker.ietf.org/doc/html/rfc2295#section-8.1)]
511    (506, VARIANT_ALSO_NEGOTIATES, "Variant Also Negotiates");
512    /// 507 Insufficient Storage
513    /// [[RFC4918, Section 11.5](https://datatracker.ietf.org/doc/html/rfc4918#section-11.5)]
514    (507, INSUFFICIENT_STORAGE, "Insufficient Storage");
515    /// 508 Loop Detected
516    /// [[RFC5842, Section 7.2](https://datatracker.ietf.org/doc/html/rfc5842#section-7.2)]
517    (508, LOOP_DETECTED, "Loop Detected");
518
519    /// 510 Not Extended
520    /// [[RFC2774, Section 7](https://datatracker.ietf.org/doc/html/rfc2774#section-7)]
521    (510, NOT_EXTENDED, "Not Extended");
522    /// 511 Network Authentication Required
523    /// [[RFC6585, Section 6](https://datatracker.ietf.org/doc/html/rfc6585#section-6)]
524    (511, NETWORK_AUTHENTICATION_REQUIRED, "Network Authentication Required");
525}
526
527impl InvalidStatusCode {
528    const fn new() -> InvalidStatusCode {
529        InvalidStatusCode { _priv: () }
530    }
531}
532
533impl fmt::Debug for InvalidStatusCode {
534    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
535        f.debug_struct("InvalidStatusCode")
536            // skip _priv noise
537            .finish()
538    }
539}
540
541impl fmt::Display for InvalidStatusCode {
542    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
543        f.write_str("invalid status code")
544    }
545}
546
547impl Error for InvalidStatusCode {}
548
549// A string of packed 3-ASCII-digit status code values for the supported range
550// of [100, 999] (900 codes, 2700 bytes).
551const CODE_DIGITS: &str = "\
552100101102103104105106107108109110111112113114115116117118119\
553120121122123124125126127128129130131132133134135136137138139\
554140141142143144145146147148149150151152153154155156157158159\
555160161162163164165166167168169170171172173174175176177178179\
556180181182183184185186187188189190191192193194195196197198199\
557200201202203204205206207208209210211212213214215216217218219\
558220221222223224225226227228229230231232233234235236237238239\
559240241242243244245246247248249250251252253254255256257258259\
560260261262263264265266267268269270271272273274275276277278279\
561280281282283284285286287288289290291292293294295296297298299\
562300301302303304305306307308309310311312313314315316317318319\
563320321322323324325326327328329330331332333334335336337338339\
564340341342343344345346347348349350351352353354355356357358359\
565360361362363364365366367368369370371372373374375376377378379\
566380381382383384385386387388389390391392393394395396397398399\
567400401402403404405406407408409410411412413414415416417418419\
568420421422423424425426427428429430431432433434435436437438439\
569440441442443444445446447448449450451452453454455456457458459\
570460461462463464465466467468469470471472473474475476477478479\
571480481482483484485486487488489490491492493494495496497498499\
572500501502503504505506507508509510511512513514515516517518519\
573520521522523524525526527528529530531532533534535536537538539\
574540541542543544545546547548549550551552553554555556557558559\
575560561562563564565566567568569570571572573574575576577578579\
576580581582583584585586587588589590591592593594595596597598599\
577600601602603604605606607608609610611612613614615616617618619\
578620621622623624625626627628629630631632633634635636637638639\
579640641642643644645646647648649650651652653654655656657658659\
580660661662663664665666667668669670671672673674675676677678679\
581680681682683684685686687688689690691692693694695696697698699\
582700701702703704705706707708709710711712713714715716717718719\
583720721722723724725726727728729730731732733734735736737738739\
584740741742743744745746747748749750751752753754755756757758759\
585760761762763764765766767768769770771772773774775776777778779\
586780781782783784785786787788789790791792793794795796797798799\
587800801802803804805806807808809810811812813814815816817818819\
588820821822823824825826827828829830831832833834835836837838839\
589840841842843844845846847848849850851852853854855856857858859\
590860861862863864865866867868869870871872873874875876877878879\
591880881882883884885886887888889890891892893894895896897898899\
592900901902903904905906907908909910911912913914915916917918919\
593920921922923924925926927928929930931932933934935936937938939\
594940941942943944945946947948949950951952953954955956957958959\
595960961962963964965966967968969970971972973974975976977978979\
596980981982983984985986987988989990991992993994995996997998999";
http/status.rs

http/
status.rs
