feat: make ContentType helper constructor const fn

src/common/content_type.rs

@@ -44,54 +44,54 @@ pub struct ContentType(Mime);
 impl ContentType {
  /// A constructor to easily create a `Content-Type: application/json` header.
  #[inline]
- pub fn json() -> ContentType {
+ pub const fn json() -> ContentType {
  ContentType(mime::APPLICATION_JSON)
  }
 
  /// A constructor to easily create a `Content-Type: text/plain` header.
  #[inline]
- pub fn text() -> ContentType {
+ pub const fn text() -> ContentType {
  ContentType(mime::TEXT_PLAIN)
  }
 
  /// A constructor to easily create a `Content-Type: text/plain; charset=utf-8` header.
  #[inline]
- pub fn text_utf8() -> ContentType {
+ pub const fn text_utf8() -> ContentType {
  ContentType(mime::TEXT_PLAIN_UTF_8)
  }
 
  /// A constructor to easily create a `Content-Type: text/html` header.
  #[inline]
- pub fn html() -> ContentType {
+ pub const fn html() -> ContentType {
  ContentType(mime::TEXT_HTML)
  }
 
  /// A constructor to easily create a `Content-Type: text/xml` header.
  #[inline]
- pub fn xml() -> ContentType {
+ pub const fn xml() -> ContentType {
  ContentType(mime::TEXT_XML)
  }
 
  /// A constructor to easily create a `Content-Type: application/www-form-url-encoded` header.
  #[inline]
- pub fn form_url_encoded() -> ContentType {
+ pub const fn form_url_encoded() -> ContentType {
  ContentType(mime::APPLICATION_WWW_FORM_URLENCODED)
  }
  /// A constructor to easily create a `Content-Type: image/jpeg` header.
  #[inline]
- pub fn jpeg() -> ContentType {
+ pub const fn jpeg() -> ContentType {
  ContentType(mime::IMAGE_JPEG)
  }
 
  /// A constructor to easily create a `Content-Type: image/png` header.
  #[inline]
- pub fn png() -> ContentType {
+ pub const fn png() -> ContentType {
  ContentType(mime::IMAGE_PNG)
  }
 
  /// A constructor to easily create a `Content-Type: application/octet-stream` header.
  #[inline]
- pub fn octet_stream() -> ContentType {
+ pub const fn octet_stream() -> ContentType {
  ContentType(mime::APPLICATION_OCTET_STREAM)
  }
 }