Mercurial > hg > nginx
annotate README @ 8567:4983357258d7 quic
QUIC: a bandaid for calculating ack_delay with non-monotonic time.
author | Sergey Kandaurov <pluknet@nginx.com> |
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date | Thu, 01 Oct 2020 12:10:37 +0100 |
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8366 | 1 Experimental QUIC support for nginx |
2 ----------------------------------- | |
3 | |
4 1. Introduction | |
5 2. Installing | |
6 3. Configuration | |
7 4. Clients | |
8 5. Troubleshooting | |
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9 6. Contributing |
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10 7. Links |
8366 | 11 |
12 1. Introduction | |
13 | |
14 This is an experimental QUIC [1] / HTTP/3 [2] support for nginx. | |
15 | |
16 The code is developed in a separate "quic" branch available | |
17 at https://hg.nginx.org/nginx-quic. Currently it is based | |
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18 on nginx mainline 1.19.x. We are planning to merge new nginx |
8366 | 19 releases into this branch regularly. |
20 | |
21 The project code base is under the same BSD license as nginx. | |
22 | |
23 The code is at an early alpha level of quality and should not | |
24 be used in production. | |
25 | |
26 We are working on improving HTTP/3 support with the goal of | |
27 integrating it to the main NGINX codebase. Expect frequent | |
28 updates of this code and don't rely on it for whatever purpose. | |
29 | |
30 We'll be grateful for any feedback and code submissions however | |
31 we don't bear any responsibilities for any issues with this code. | |
32 | |
33 You can always contact us via nginx-devel mailing list [3]. | |
34 | |
35 What works now: | |
36 | |
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37 Currently we support IETF-QUIC draft-27, draft-28, draft-29. |
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38 Earlier drafts are NOT supported as they have incompatible wire format. |
8366 | 39 |
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40 You may look at src/event/ngx_event_quic.h for alternative values of the |
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41 NGX_QUIC_DRAFT_VERSION macro used to select IETF draft version number. |
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42 |
8366 | 43 nginx should be able to respond to simple HTTP/3 requests over QUIC and |
44 it should be possible to upload and download big files without errors. | |
45 | |
46 + The handshake completes successfully | |
47 + One endpoint can update keys and its peer responds correctly | |
8390 | 48 + 0-RTT data is being received and acted on |
8366 | 49 + Connection is established using TLS Resume Ticket |
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50 + A handshake that includes a Retry packet completes successfully |
8366 | 51 + Stream data is being exchanged and ACK'ed |
52 + An H3 transaction succeeded | |
53 + One or both endpoints insert entries into dynamic table and | |
54 subsequently reference them from header blocks | |
8527 | 55 + Version Negotiation packet is sent to client with unknown version |
56 + Lost packets are detected and retransmitted properly | |
8366 | 57 |
58 Not (yet) supported features: | |
59 | |
8527 | 60 - Explicit Congestion Notification (ECN) as specified in quic-recovery [5] |
8366 | 61 - A connection with the spin bit succeeds and the bit is spinning |
62 - Structured Logging | |
63 - NAT Rebinding | |
64 - Address Mobility | |
65 - HTTP/3 trailers | |
66 | |
67 Since the code is experimental and still under development, | |
68 a lot of things may not work as expected, for example: | |
69 | |
70 - ACK handling is basic: every received ack-eliciting packet | |
71 is acknowledged, no ack ranges are used | |
72 | |
73 - Flow control mechanism is basic and intended to avoid CPU hog and make | |
74 simple interactions possible | |
75 | |
76 - Not all draft requirements are strictly followed; some of checks are | |
77 omitted for the sake of simplicity of initial implementation | |
78 | |
79 2. Installing | |
80 | |
81 You will need a BoringSSL [4] library that provides QUIC support | |
82 | |
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83 $ hg clone -b quic https://hg.nginx.org/nginx-quic |
8366 | 84 $ cd nginx-quic |
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85 $ ./auto/configure --with-debug --with-http_v3_module \ |
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86 --with-cc-opt="-I../boringssl/include" \ |
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87 --with-ld-opt="-L../boringssl/build/ssl \ |
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88 -L../boringssl/build/crypto" |
8366 | 89 $ make |
90 | |
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91 When configuring nginx, you can enable QUIC and HTTP/3 using the |
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92 following new configuration options: |
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93 |
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94 --with-http_v3_module - enable QUIC and HTTP/3 |
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95 --with-http_quic_module - enable QUIC for older HTTP versions |
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96 --with-stream_quic_module - enable QUIC in Stream |
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97 |
8366 | 98 3. Configuration |
99 | |
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100 The HTTP "listen" directive got two new options: "http3" and "quic". |
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101 The "http3" option enables HTTP/3 over QUIC on the specified port. |
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102 The "quic" option enables QUIC for older HTTP versions on this port. |
8366 | 103 |
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104 The Stream "listen" directive got a new option "quic" which enables |
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105 QUIC as client transport protocol instead of TCP or plain UDP. |
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106 |
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107 Along with "http3" or "quic", you also have to specify "reuseport" |
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108 option [6] to make it work properly with multiple workers. |
8366 | 109 |
110 A number of directives were added that specify transport parameter values: | |
111 | |
112 quic_max_idle_timeout | |
113 quic_max_ack_delay | |
114 quic_max_packet_size | |
115 quic_initial_max_data | |
116 quic_initial_max_stream_data_bidi_local | |
117 quic_initial_max_stream_data_bidi_remote | |
118 quic_initial_max_stream_data_uni | |
119 quic_initial_max_streams_bidi | |
120 quic_initial_max_streams_uni | |
121 quic_ack_delay_exponent | |
122 quic_active_migration | |
123 quic_active_connection_id_limit | |
124 | |
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125 To enable address validation: |
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126 |
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127 quic_retry on; |
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128 |
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129 To enable 0-RTT: |
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130 |
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131 ssl_early_data on; |
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132 |
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133 Make sure that TLS 1.3 is configured which is required for QUIC: |
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134 |
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135 ssl_protocols TLSv1.3; |
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136 |
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137 A number of directives were added that configure HTTP/3: |
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138 |
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139 http3_max_field_size |
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140 http3_max_table_capacity |
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141 http3_max_blocked_streams |
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142 http3_max_concurrent_pushes |
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143 http3_push |
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144 http3_push_preload |
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145 |
8366 | 146 Two additional variables are available: $quic and $http3. |
147 The value of $quic is "quic" if QUIC connection is used, | |
148 and empty string otherwise. The value of $http3 is a string | |
149 "h3-xx" where "xx" is the supported draft number. | |
150 | |
151 Example configuration: | |
152 | |
153 http { | |
154 log_format quic '$remote_addr - $remote_user [$time_local] ' | |
155 '"$request" $status $body_bytes_sent ' | |
156 '"$http_referer" "$http_user_agent" "$quic" "$http3"'; | |
157 | |
158 access_log logs/access.log quic; | |
159 | |
160 server { | |
161 # for better compatibility it's recommended | |
162 # to use the same port for quic and https | |
163 listen 8443 http3 reuseport; | |
164 listen 8443 ssl; | |
165 | |
166 ssl_certificate certs/example.com.crt; | |
167 ssl_certificate_key certs/example.com.key; | |
168 ssl_protocols TLSv1.3; | |
169 | |
170 location / { | |
171 # required for browsers to direct them into quic port | |
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172 add_header Alt-Svc '$http3=":8443"; ma=86400'; |
8366 | 173 } |
174 } | |
175 } | |
176 | |
177 4. Clients | |
178 | |
179 * Browsers | |
180 | |
181 Known to work: Firefox 75+ and Chrome 83+ | |
182 | |
183 Beware of strange issues: sometimes browser may decide to ignore QUIC | |
184 Cache clearing/restart might help. Always check access.log and | |
185 error.log to make sure you are using HTTP/3 and not TCP https. | |
186 | |
187 + to enable QUIC in Firefox, set the following in 'about:config': | |
188 network.http.http3.enabled = true | |
189 | |
190 + to enable QUIC in Chrome, enable it on command line and force it | |
191 on your site: | |
192 | |
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193 $ ./chrome --enable-quic --quic-version=h3-29 \ |
8366 | 194 --origin-to-force-quic-on=example.com:8443 |
195 | |
196 * Console clients | |
197 | |
198 Known to work: ngtcp2, firefox's neqo and chromium's console clients: | |
199 | |
200 $ examples/client 127.0.0.1 8443 https://example.com:8443/index.html | |
201 | |
202 $ ./neqo-client https://127.0.0.1:8443/ | |
203 | |
204 $ chromium-build/out/my_build/quic_client http://example.com:8443 \ | |
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205 --quic_version=h3-29 \ |
8366 | 206 --allow_unknown_root_cert \ |
207 --disable_certificate_verification | |
208 | |
209 | |
210 If you've got it right, in the access log you should see something like: | |
211 | |
212 127.0.0.1 - - [24/Apr/2020:11:27:29 +0300] "GET / HTTP/3" 200 805 "-" | |
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213 "nghttp3/ngtcp2 client" "quic" "h3-29" |
8366 | 214 |
215 | |
216 5. Troubleshooting | |
217 | |
218 Here are some tips that may help you to identify problems: | |
219 | |
220 + Ensure you are building with proper SSL library that | |
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221 implements draft 29 |
8366 | 222 |
223 + Ensure you are using the proper SSL library in runtime | |
224 (`nginx -V` will show you what you are using) | |
225 | |
226 + Ensure your client is actually sending QUIC requests | |
227 (see "Clients" section about browsers and cache) | |
228 | |
229 We recommend to start with simple console client like ngtcp2 | |
230 to ensure you've got server configured properly before trying | |
8395 | 231 with real browsers that may be very picky with certificates, |
8366 | 232 for example. |
233 | |
234 + Build nginx with debug support [7] and check your debug log. | |
235 It should contain all details about connection and why it | |
236 failed. All related messages contain "quic " prefix and can | |
237 be easily filtered out. | |
238 | |
239 + If you want to investigate deeper, you may want to enable | |
240 additional debugging in src/event/ngx_event_quic.h: | |
241 | |
242 #define NGX_QUIC_DEBUG_PACKETS | |
243 #define NGX_QUIC_DEBUG_FRAMES | |
244 #define NGX_QUIC_DEBUG_FRAMES_ALLOC | |
245 #define NGX_QUIC_DEBUG_CRYPTO | |
246 | |
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247 6. Contributing |
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248 |
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249 If you are willing to contribute, please refer to |
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250 http://nginx.org/en/docs/contributing_changes.html |
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251 |
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252 7. Links |
8366 | 253 |
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254 [1] https://tools.ietf.org/html/draft-ietf-quic-transport-29 |
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255 [2] https://tools.ietf.org/html/draft-ietf-quic-http-29 |
8366 | 256 [3] https://mailman.nginx.org/mailman/listinfo/nginx-devel |
257 [4] https://boringssl.googlesource.com/boringssl/ | |
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258 [5] https://tools.ietf.org/html/draft-ietf-quic-recovery-29 |
8366 | 259 [6] https://nginx.org/en/docs/http/ngx_http_core_module.html#listen |
260 [7] https://nginx.org/en/docs/debugging_log.html |