barehttp 0.0.1

A minimal, explicit HTTP client for Rust with no_std support and blocking I/O
Documentation 
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
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248

use crate::parser::BodyReadStrategy;
use crate::parser::response_reader::ResponseReader;
use alloc::format;

#[test]
fn test_rfc9112_content_length_response() {
  // RFC 9112 Section 6.2: Content-Length
  // Body length is determined by Content-Length header

  let mut reader = ResponseReader::new();

  let response = b"HTTP/1.1 200 OK\r\nContent-Length: 13\r\n\r\nHello, World!";
  reader.feed(response).expect("feed failed");

  assert!(reader.has_complete_headers());

  let (status, reason, headers, strategy) = reader.parse_headers().expect("parse failed");
  assert_eq!(status, 200);
  assert_eq!(reason, "OK");
  assert_eq!(strategy, BodyReadStrategy::ContentLength(13));
  assert!(reader.is_body_complete());

  let body = reader.finish(&headers, status).expect("finish failed");
  assert_eq!(body.as_bytes(), b"Hello, World!");
}

#[test]
fn test_rfc9112_section_6_3_chunked_response() {
  // RFC 9112 Section 6.3: Transfer-Encoding overrides Content-Length
  // RFC 9112 Section 7.1: Chunked Transfer Coding

  let mut reader = ResponseReader::new();

  reader
    .feed(b"HTTP/1.1 200 OK\r\nTransfer-Encoding: chunked\r\n\r\n")
    .expect("feed failed");
  assert!(reader.has_complete_headers());

  let (status, _reason, headers, strategy) = reader.parse_headers().expect("parse failed");
  assert_eq!(strategy, BodyReadStrategy::Chunked);

  // Feed chunked body: "hello"
  reader.feed(b"5\r\nhello\r\n").expect("feed failed");
  assert!(!reader.is_body_complete());

  // Feed terminating chunk
  reader.feed(b"0\r\n\r\n").expect("feed failed");
  assert!(reader.is_body_complete());

  let body = reader.finish(&headers, status).expect("finish failed");
  assert_eq!(body.as_bytes(), b"hello");
}

#[test]
fn test_rfc9112_section_6_no_body_responses() {
  // RFC 9112 Section 6.3: Certain responses never have a body
  // 1xx (Informational), 204 (No Content), 304 (Not Modified)

  // Test 204 No Content
  let mut reader = ResponseReader::new();
  reader
    .feed(b"HTTP/1.1 204 No Content\r\n\r\n")
    .expect("feed failed");

  let (status, _reason, headers, strategy) = reader.parse_headers().expect("parse failed");
  assert_eq!(status, 204);
  assert_eq!(strategy, BodyReadStrategy::NoBody);
  assert!(reader.is_body_complete());

  let body = reader.finish(&headers, status).expect("finish failed");
  assert_eq!(body.as_bytes(), b"");

  // Test 304 Not Modified
  let mut reader2 = ResponseReader::new();
  reader2
    .feed(b"HTTP/1.1 304 Not Modified\r\n\r\n")
    .expect("feed failed");

  let (status2, _reason2, headers2, strategy2) = reader2.parse_headers().expect("parse failed");
  assert_eq!(status2, 304);
  assert_eq!(strategy2, BodyReadStrategy::NoBody);

  let body2 = reader2.finish(&headers2, status2).expect("finish failed");
  assert_eq!(body2.as_bytes(), b"");
}

#[test]
fn test_rfc9112_incremental_header_reading() {
  // RFC 9112 Section 2: Message Parsing
  // Headers arrive incrementally

  let mut reader = ResponseReader::new();

  reader.feed(b"HTTP/1.1 200 OK\r\n").expect("feed failed");
  assert!(!reader.has_complete_headers());

  reader
    .feed(b"Content-Type: text/plain\r\n")
    .expect("feed failed");
  assert!(!reader.has_complete_headers());

  reader.feed(b"Content-Length: 4\r\n").expect("feed failed");
  assert!(!reader.has_complete_headers());

  reader.feed(b"\r\n").expect("feed failed");
  assert!(reader.has_complete_headers());

  let (_status, _reason, _headers, strategy) = reader.parse_headers().expect("parse failed");
  assert_eq!(strategy, BodyReadStrategy::ContentLength(4));
}

#[test]
fn test_rfc9112_header_size_limit() {
  // RFC 9112 Section 2.1: Implementations ought to be careful about header size

  let mut reader = ResponseReader::with_max_header_size(50);

  // This should fit
  let small_headers = b"HTTP/1.1 200 OK\r\nContent-Length: 0\r\n\r\n";
  assert!(reader.feed(small_headers).is_ok());

  // Create a reader with tiny limit
  let mut small_reader = ResponseReader::with_max_header_size(20);
  let large_headers = b"HTTP/1.1 200 OK\r\nX-Large-Header: value\r\n\r\n";

  // Should exceed limit
  let result = small_reader.feed(large_headers);
  assert!(result.is_err());
}

#[test]
fn test_bytes_needed_tracking() {
  // Test that bytes_needed correctly tracks remaining bytes

  let mut reader = ResponseReader::new();

  reader
    .feed(b"HTTP/1.1 200 OK\r\nContent-Length: 20\r\n\r\n")
    .expect("feed failed");
  let (_status, _reason, _headers, strategy) = reader.parse_headers().expect("parse failed");
  assert_eq!(strategy, BodyReadStrategy::ContentLength(20));

  // No body yet
  assert_eq!(reader.bytes_needed(), Some(20));

  // Add 10 bytes
  reader.feed(b"1234567890").expect("feed failed");
  assert_eq!(reader.bytes_needed(), Some(10));
  assert!(!reader.is_body_complete());

  // Add remaining 10 bytes
  reader.feed(b"abcdefghij").expect("feed failed");
  assert_eq!(reader.bytes_needed(), Some(0));
  assert!(reader.is_body_complete());
}

#[test]
fn test_multiple_chunk_response() {
  // Test reading a response with multiple chunks

  let mut reader = ResponseReader::new();

  reader
    .feed(b"HTTP/1.1 200 OK\r\nTransfer-Encoding: chunked\r\n\r\n")
    .expect("feed failed");
  let (status, _reason, headers, strategy) = reader.parse_headers().expect("parse failed");
  assert_eq!(strategy, BodyReadStrategy::Chunked);

  // First chunk: "Hello"
  reader.feed(b"5\r\nHello\r\n").expect("feed failed");
  assert!(!reader.is_body_complete());

  // Second chunk: ", "
  reader.feed(b"2\r\n, \r\n").expect("feed failed");
  assert!(!reader.is_body_complete());

  // Third chunk: "World"
  reader.feed(b"5\r\nWorld\r\n").expect("feed failed");
  assert!(!reader.is_body_complete());

  // Terminating chunk
  reader.feed(b"0\r\n\r\n").expect("feed failed");
  assert!(reader.is_body_complete());

  let body = reader.finish(&headers, status).expect("finish failed");
  assert_eq!(body.as_bytes(), b"Hello, World");
}

#[test]
fn test_response_with_no_content_length() {
  // RFC 9112: Without Content-Length or Transfer-Encoding,
  // responses should have no body (for most cases)

  let mut reader = ResponseReader::new();

  reader
    .feed(b"HTTP/1.1 200 OK\r\nContent-Type: text/plain\r\n\r\n")
    .expect("feed failed");
  let (status, _reason, headers, strategy) = reader.parse_headers().expect("parse failed");

  // Without Content-Length or Transfer-Encoding, assume no body
  assert_eq!(strategy, BodyReadStrategy::NoBody);

  let body = reader.finish(&headers, status).expect("finish failed");
  assert_eq!(body.as_bytes(), b"");
}

#[test]
fn test_1xx_informational_responses() {
  // RFC 9112 Section 6.3: 1xx responses never have a body

  for code in 100..200 {
    let mut reader = ResponseReader::new();
    let response = format!("HTTP/1.1 {code} Continue\r\n\r\n");
    reader.feed(response.as_bytes()).expect("feed failed");

    let (status, _reason, headers, strategy) = reader.parse_headers().expect("parse failed");
    assert_eq!(status, code);
    assert_eq!(strategy, BodyReadStrategy::NoBody);

    let body = reader.finish(&headers, status).expect("finish failed");
    assert_eq!(body.as_bytes(), b"");
  }
}

#[test]
fn test_chunked_with_extensions() {
  // RFC 9112 Section 7.1.1: Chunk extensions are allowed but we ignore them

  let mut reader = ResponseReader::new();

  reader
    .feed(b"HTTP/1.1 200 OK\r\nTransfer-Encoding: chunked\r\n\r\n")
    .expect("feed failed");
  let (status, _reason, headers, _strategy) = reader.parse_headers().expect("parse failed");

  // Chunk with extension (should still work)
  reader
    .feed(b"5;name=value\r\nhello\r\n")
    .expect("feed failed");
  reader.feed(b"0\r\n\r\n").expect("feed failed");

  assert!(reader.is_body_complete());

  let body = reader.finish(&headers, status).expect("finish failed");
  // Body should still be decoded correctly despite extensions
  assert_eq!(body.as_bytes(), b"hello");
}