1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227

#![doc = include_str!("../docs/response.md")]

use axum_core::body::Body;
use http::{header, HeaderValue};

mod redirect;

#[cfg(feature = "tokio")]
pub mod sse;

#[doc(no_inline)]
#[cfg(feature = "json")]
pub use crate::Json;

#[cfg(feature = "form")]
#[doc(no_inline)]
pub use crate::form::Form;

#[doc(no_inline)]
pub use crate::Extension;

#[doc(inline)]
pub use axum_core::response::{
    AppendHeaders, ErrorResponse, IntoResponse, IntoResponseParts, Response, ResponseParts, Result,
};

#[doc(inline)]
pub use self::redirect::Redirect;

#[doc(inline)]
#[cfg(feature = "tokio")]
pub use sse::Sse;

/// An HTML response.
///
/// Will automatically get `Content-Type: text/html`.
#[derive(Clone, Copy, Debug)]
#[must_use]
pub struct Html<T>(pub T);

impl<T> IntoResponse for Html<T>
where
    T: Into<Body>,
{
    fn into_response(self) -> Response {
        (
            [(
                header::CONTENT_TYPE,
                HeaderValue::from_static(mime::TEXT_HTML_UTF_8.as_ref()),
            )],
            self.0.into(),
        )
            .into_response()
    }
}

impl<T> From<T> for Html<T> {
    fn from(inner: T) -> Self {
        Self(inner)
    }
}

#[cfg(test)]
mod tests {
    use crate::extract::Extension;
    use crate::{routing::get, Router};
    use axum_core::response::IntoResponse;
    use http::HeaderMap;
    use http::{StatusCode, Uri};

    // just needs to compile
    #[allow(dead_code)]
    fn impl_trait_result_works() {
        async fn impl_trait_ok() -> Result<impl IntoResponse, ()> {
            Ok(())
        }

        async fn impl_trait_err() -> Result<(), impl IntoResponse> {
            Err(())
        }

        async fn impl_trait_both(uri: Uri) -> Result<impl IntoResponse, impl IntoResponse> {
            if uri.path() == "/" {
                Ok(())
            } else {
                Err(())
            }
        }

        async fn impl_trait(uri: Uri) -> impl IntoResponse {
            if uri.path() == "/" {
                Ok(())
            } else {
                Err(())
            }
        }

        _ = Router::<()>::new()
            .route("/", get(impl_trait_ok))
            .route("/", get(impl_trait_err))
            .route("/", get(impl_trait_both))
            .route("/", get(impl_trait));
    }

    // just needs to compile
    #[allow(dead_code)]
    fn tuple_responses() {
        async fn status() -> impl IntoResponse {
            StatusCode::OK
        }

        async fn status_headermap() -> impl IntoResponse {
            (StatusCode::OK, HeaderMap::new())
        }

        async fn status_header_array() -> impl IntoResponse {
            (StatusCode::OK, [("content-type", "text/plain")])
        }

        async fn status_headermap_body() -> impl IntoResponse {
            (StatusCode::OK, HeaderMap::new(), String::new())
        }

        async fn status_header_array_body() -> impl IntoResponse {
            (
                StatusCode::OK,
                [("content-type", "text/plain")],
                String::new(),
            )
        }

        async fn status_headermap_impl_into_response() -> impl IntoResponse {
            (StatusCode::OK, HeaderMap::new(), impl_into_response())
        }

        async fn status_header_array_impl_into_response() -> impl IntoResponse {
            (
                StatusCode::OK,
                [("content-type", "text/plain")],
                impl_into_response(),
            )
        }

        fn impl_into_response() -> impl IntoResponse {}

        async fn status_header_array_extension_body() -> impl IntoResponse {
            (
                StatusCode::OK,
                [("content-type", "text/plain")],
                Extension(1),
                String::new(),
            )
        }

        async fn status_header_array_extension_mixed_body() -> impl IntoResponse {
            (
                StatusCode::OK,
                [("content-type", "text/plain")],
                Extension(1),
                HeaderMap::new(),
                String::new(),
            )
        }

        //

        async fn headermap() -> impl IntoResponse {
            HeaderMap::new()
        }

        async fn header_array() -> impl IntoResponse {
            [("content-type", "text/plain")]
        }

        async fn headermap_body() -> impl IntoResponse {
            (HeaderMap::new(), String::new())
        }

        async fn header_array_body() -> impl IntoResponse {
            ([("content-type", "text/plain")], String::new())
        }

        async fn headermap_impl_into_response() -> impl IntoResponse {
            (HeaderMap::new(), impl_into_response())
        }

        async fn header_array_impl_into_response() -> impl IntoResponse {
            ([("content-type", "text/plain")], impl_into_response())
        }

        async fn header_array_extension_body() -> impl IntoResponse {
            (
                [("content-type", "text/plain")],
                Extension(1),
                String::new(),
            )
        }

        async fn header_array_extension_mixed_body() -> impl IntoResponse {
            (
                [("content-type", "text/plain")],
                Extension(1),
                HeaderMap::new(),
                String::new(),
            )
        }

        _ = Router::<()>::new()
            .route("/", get(status))
            .route("/", get(status_headermap))
            .route("/", get(status_header_array))
            .route("/", get(status_headermap_body))
            .route("/", get(status_header_array_body))
            .route("/", get(status_headermap_impl_into_response))
            .route("/", get(status_header_array_impl_into_response))
            .route("/", get(status_header_array_extension_body))
            .route("/", get(status_header_array_extension_mixed_body))
            .route("/", get(headermap))
            .route("/", get(header_array))
            .route("/", get(headermap_body))
            .route("/", get(header_array_body))
            .route("/", get(headermap_impl_into_response))
            .route("/", get(header_array_impl_into_response))
            .route("/", get(header_array_extension_body))
            .route("/", get(header_array_extension_mixed_body));
    }
}