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annotate README @ 8450:a62849b6463c quic
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author | Vladimir Homutov <vl@nginx.com> |
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date | Fri, 19 Jun 2020 11:29:30 +0300 |
parents | 3c32717d7bb2 |
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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 | |
55 | |
56 Not (yet) supported features: | |
57 | |
58 - Version negotiation | |
59 - ECN, Congestion control and friends as specified in quic-recovery [5] | |
60 - A connection with the spin bit succeeds and the bit is spinning | |
61 - Structured Logging | |
62 - QUIC recovery (proper congestion and flow control) | |
63 - NAT Rebinding | |
64 - Address Mobility | |
65 - Server push | |
66 - HTTP/3 trailers | |
67 | |
68 Since the code is experimental and still under development, | |
69 a lot of things may not work as expected, for example: | |
70 | |
71 - ACK handling is basic: every received ack-eliciting packet | |
72 is acknowledged, no ack ranges are used | |
73 | |
74 - Flow control mechanism is basic and intended to avoid CPU hog and make | |
75 simple interactions possible | |
76 | |
77 - Not all draft requirements are strictly followed; some of checks are | |
78 omitted for the sake of simplicity of initial implementation | |
79 | |
80 2. Installing | |
81 | |
82 You will need a BoringSSL [4] library that provides QUIC support | |
83 | |
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84 $ hg clone -b quic https://hg.nginx.org/nginx-quic |
8366 | 85 $ cd nginx-quic |
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86 $ ./auto/configure --with-debug --with-http_v3_module \ |
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87 --with-cc-opt="-I../boringssl/include" \ |
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88 --with-ld-opt="-L../boringssl/build/ssl \ |
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89 -L../boringssl/build/crypto" |
8366 | 90 $ make |
91 | |
92 3. Configuration | |
93 | |
94 The "listen" directive got a new option: "http3" | |
95 which enables HTTP/3 over QUIC on the specified port. | |
96 | |
97 Along with "http3", you also have to specify "reuseport" option [6] | |
98 to make it work properly with multiple workers. | |
99 | |
100 A number of directives were added that specify transport parameter values: | |
101 | |
102 quic_max_idle_timeout | |
103 quic_max_ack_delay | |
104 quic_max_packet_size | |
105 quic_initial_max_data | |
106 quic_initial_max_stream_data_bidi_local | |
107 quic_initial_max_stream_data_bidi_remote | |
108 quic_initial_max_stream_data_uni | |
109 quic_initial_max_streams_bidi | |
110 quic_initial_max_streams_uni | |
111 quic_ack_delay_exponent | |
112 quic_active_migration | |
113 quic_active_connection_id_limit | |
114 | |
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115 To enable address validation: |
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116 |
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117 quic_retry on; |
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118 |
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119 To enable 0-RTT: |
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120 |
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121 ssl_early_data on; |
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122 |
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123 Make sure that TLS 1.3 is configured which is required for QUIC: |
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124 |
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125 ssl_protocols TLSv1.3; |
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126 |
8366 | 127 Two additional variables are available: $quic and $http3. |
128 The value of $quic is "quic" if QUIC connection is used, | |
129 and empty string otherwise. The value of $http3 is a string | |
130 "h3-xx" where "xx" is the supported draft number. | |
131 | |
132 Example configuration: | |
133 | |
134 http { | |
135 log_format quic '$remote_addr - $remote_user [$time_local] ' | |
136 '"$request" $status $body_bytes_sent ' | |
137 '"$http_referer" "$http_user_agent" "$quic" "$http3"'; | |
138 | |
139 access_log logs/access.log quic; | |
140 | |
141 server { | |
142 # for better compatibility it's recommended | |
143 # to use the same port for quic and https | |
144 listen 8443 http3 reuseport; | |
145 listen 8443 ssl; | |
146 | |
147 ssl_certificate certs/example.com.crt; | |
148 ssl_certificate_key certs/example.com.key; | |
149 ssl_protocols TLSv1.3; | |
150 | |
151 location / { | |
152 # required for browsers to direct them into quic port | |
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153 add_header Alt-Svc '$http3=":8443"; ma=86400'; |
8366 | 154 } |
155 } | |
156 } | |
157 | |
158 4. Clients | |
159 | |
160 * Browsers | |
161 | |
162 Known to work: Firefox 75+ and Chrome 83+ | |
163 | |
164 Beware of strange issues: sometimes browser may decide to ignore QUIC | |
165 Cache clearing/restart might help. Always check access.log and | |
166 error.log to make sure you are using HTTP/3 and not TCP https. | |
167 | |
168 + to enable QUIC in Firefox, set the following in 'about:config': | |
169 network.http.http3.enabled = true | |
170 | |
171 + to enable QUIC in Chrome, enable it on command line and force it | |
172 on your site: | |
173 | |
174 $ ./chrome --enable-quic --quic-version=h3-27 \ | |
175 --origin-to-force-quic-on=example.com:8443 | |
176 | |
177 * Console clients | |
178 | |
179 Known to work: ngtcp2, firefox's neqo and chromium's console clients: | |
180 | |
181 $ examples/client 127.0.0.1 8443 https://example.com:8443/index.html | |
182 | |
183 $ ./neqo-client https://127.0.0.1:8443/ | |
184 | |
185 $ chromium-build/out/my_build/quic_client http://example.com:8443 \ | |
186 --quic_version=h3-27 \ | |
187 --allow_unknown_root_cert \ | |
188 --disable_certificate_verification | |
189 | |
190 | |
191 If you've got it right, in the access log you should see something like: | |
192 | |
193 127.0.0.1 - - [24/Apr/2020:11:27:29 +0300] "GET / HTTP/3" 200 805 "-" | |
194 "nghttp3/ngtcp2 client" "quic" "h3-27" | |
195 | |
196 | |
197 5. Troubleshooting | |
198 | |
199 Here are some tips that may help you to identify problems: | |
200 | |
201 + Ensure you are building with proper SSL library that | |
202 implements draft 27 | |
203 | |
204 + Ensure you are using the proper SSL library in runtime | |
205 (`nginx -V` will show you what you are using) | |
206 | |
207 + Ensure your client is actually sending QUIC requests | |
208 (see "Clients" section about browsers and cache) | |
209 | |
210 We recommend to start with simple console client like ngtcp2 | |
211 to ensure you've got server configured properly before trying | |
8395 | 212 with real browsers that may be very picky with certificates, |
8366 | 213 for example. |
214 | |
215 + Build nginx with debug support [7] and check your debug log. | |
216 It should contain all details about connection and why it | |
217 failed. All related messages contain "quic " prefix and can | |
218 be easily filtered out. | |
219 | |
220 + If you want to investigate deeper, you may want to enable | |
221 additional debugging in src/event/ngx_event_quic.h: | |
222 | |
223 #define NGX_QUIC_DEBUG_PACKETS | |
224 #define NGX_QUIC_DEBUG_FRAMES | |
225 #define NGX_QUIC_DEBUG_FRAMES_ALLOC | |
226 #define NGX_QUIC_DEBUG_CRYPTO | |
227 | |
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228 6. Contributing |
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229 |
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230 If you are willing to contribute, please refer to |
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231 http://nginx.org/en/docs/contributing_changes.html |
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232 |
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233 7. Links |
8366 | 234 |
235 [1] https://tools.ietf.org/html/draft-ietf-quic-transport-27 | |
236 [2] https://tools.ietf.org/html/draft-ietf-quic-http-27 | |
237 [3] https://mailman.nginx.org/mailman/listinfo/nginx-devel | |
238 [4] https://boringssl.googlesource.com/boringssl/ | |
239 [5] https://tools.ietf.org/html/draft-ietf-quic-recovery-27 | |
240 [6] https://nginx.org/en/docs/http/ngx_http_core_module.html#listen | |
241 [7] https://nginx.org/en/docs/debugging_log.html |