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annotate README @ 8924:d6ef13c5fd8e quic
QUIC: simplified configuration.
Directives that set transport parameters are removed from the configuration.
Corresponding values are derived from the quic configuration or initialized
to default. Whenever possible, quic configuration parameters are taken from
higher-level protocol settings, i.e. HTTP/3.
author | Vladimir Homutov <vl@nginx.com> |
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date | Mon, 06 Dec 2021 15:19:54 +0300 |
parents | 651cc905b7c2 |
children | 44553428288d |
rev | line source |
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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 1.21.x. We merge new nginx releases into |
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19 this branch regularly. |
8366 | 20 |
21 The project code base is under the same BSD license as nginx. | |
22 | |
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23 The code is currently at a beta level of quality and should not |
8366 | 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-29 through final RFC documents. |
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38 Earlier drafts are NOT supported as they have incompatible wire format. |
8366 | 39 |
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40 nginx should be able to respond to HTTP/3 requests over QUIC and |
8366 | 41 it should be possible to upload and download big files without errors. |
42 | |
43 + The handshake completes successfully | |
44 + One endpoint can update keys and its peer responds correctly | |
8390 | 45 + 0-RTT data is being received and acted on |
8366 | 46 + Connection is established using TLS Resume Ticket |
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47 + A handshake that includes a Retry packet completes successfully |
8366 | 48 + Stream data is being exchanged and ACK'ed |
49 + An H3 transaction succeeded | |
50 + One or both endpoints insert entries into dynamic table and | |
51 subsequently reference them from header blocks | |
8527 | 52 + Version Negotiation packet is sent to client with unknown version |
53 + Lost packets are detected and retransmitted properly | |
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54 + Clients may migrate to new address |
8366 | 55 |
56 Not (yet) supported features: | |
57 | |
8527 | 58 - Explicit Congestion Notification (ECN) as specified in quic-recovery [5] |
8366 | 59 - A connection with the spin bit succeeds and the bit is spinning |
60 - Structured Logging | |
61 | |
62 Since the code is experimental and still under development, | |
63 a lot of things may not work as expected, for example: | |
64 | |
65 - Flow control mechanism is basic and intended to avoid CPU hog and make | |
66 simple interactions possible | |
67 | |
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68 - Not all protocol requirements are strictly followed; some of checks are |
8366 | 69 omitted for the sake of simplicity of initial implementation |
70 | |
71 2. Installing | |
72 | |
73 You will need a BoringSSL [4] library that provides QUIC support | |
74 | |
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75 $ hg clone -b quic https://hg.nginx.org/nginx-quic |
8366 | 76 $ cd nginx-quic |
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77 $ ./auto/configure --with-debug --with-http_v3_module \ |
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78 --with-cc-opt="-I../boringssl/include" \ |
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79 --with-ld-opt="-L../boringssl/build/ssl \ |
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80 -L../boringssl/build/crypto" |
8366 | 81 $ make |
82 | |
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83 When configuring nginx, you can enable QUIC and HTTP/3 using the |
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84 following new configuration options: |
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85 |
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86 --with-http_v3_module - enable QUIC and HTTP/3 |
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87 --with-http_quic_module - enable QUIC for older HTTP versions |
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88 --with-stream_quic_module - enable QUIC in Stream |
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89 |
8366 | 90 3. Configuration |
91 | |
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92 The HTTP "listen" directive got a new option "http3" which enables |
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93 HTTP/3 over QUIC on the specified port. |
8366 | 94 |
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95 The Stream "listen" directive got a new option "quic" which enables |
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96 QUIC as client transport protocol instead of TCP or plain UDP. |
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97 |
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98 Along with "http3" or "quic", you also have to specify "reuseport" |
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99 option [6] to make it work properly with multiple workers. |
8366 | 100 |
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101 To enable address validation: |
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102 |
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103 quic_retry on; |
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104 |
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105 To enable 0-RTT: |
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106 |
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107 ssl_early_data on; |
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108 |
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109 Make sure that TLS 1.3 is configured which is required for QUIC: |
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110 |
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111 ssl_protocols TLSv1.3; |
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112 |
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113 To enable GSO (Generic Segmentation Offloading): |
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114 |
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115 quic_gso on; |
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116 |
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117 To limit maximum packet size: |
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118 |
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119 quic_mtu <size>; |
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120 |
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121 To set host key for various tokens: |
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122 |
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123 quic_host_key <filename>; |
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124 |
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125 |
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126 By default this Linux-specific optimization [8] is disabled. |
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127 Enable if your network interface is configured to support GSO. |
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128 |
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129 A number of directives were added that configure HTTP/3: |
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130 |
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131 http3_stream_buffer_size |
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132 http3_max_concurrent_pushes |
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133 http3_max_concurrent_streams |
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134 http3_push |
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135 http3_push_preload |
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136 http3_hq (requires NGX_HTTP_V3_HQ macro) |
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137 |
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138 In http, an additional variable is available: $http3. |
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139 The value of $http3 is "h3" for HTTP/3 connections, |
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140 "hq" for hq connections, or an empty string otherwise. |
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141 |
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142 In stream, an additional variable is available: $quic. |
8366 | 143 The value of $quic is "quic" if QUIC connection is used, |
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144 or an empty string otherwise. |
8366 | 145 |
146 Example configuration: | |
147 | |
148 http { | |
149 log_format quic '$remote_addr - $remote_user [$time_local] ' | |
150 '"$request" $status $body_bytes_sent ' | |
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151 '"$http_referer" "$http_user_agent" "$quic"'; |
8366 | 152 |
153 access_log logs/access.log quic; | |
154 | |
155 server { | |
156 # for better compatibility it's recommended | |
157 # to use the same port for quic and https | |
158 listen 8443 http3 reuseport; | |
159 listen 8443 ssl; | |
160 | |
161 ssl_certificate certs/example.com.crt; | |
162 ssl_certificate_key certs/example.com.key; | |
163 ssl_protocols TLSv1.3; | |
164 | |
165 location / { | |
166 # required for browsers to direct them into quic port | |
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167 add_header Alt-Svc 'h3=":8443"; ma=86400'; |
8366 | 168 } |
169 } | |
170 } | |
171 | |
172 4. Clients | |
173 | |
174 * Browsers | |
175 | |
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176 Known to work: Firefox 80+ and Chrome 85+ (QUIC draft 29+) |
8366 | 177 |
178 Beware of strange issues: sometimes browser may decide to ignore QUIC | |
179 Cache clearing/restart might help. Always check access.log and | |
180 error.log to make sure you are using HTTP/3 and not TCP https. | |
181 | |
182 + to enable QUIC in Firefox, set the following in 'about:config': | |
183 network.http.http3.enabled = true | |
184 | |
185 + to enable QUIC in Chrome, enable it on command line and force it | |
186 on your site: | |
187 | |
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188 $ ./chrome --enable-quic --quic-version=h3-29 \ |
8366 | 189 --origin-to-force-quic-on=example.com:8443 |
190 | |
191 * Console clients | |
192 | |
193 Known to work: ngtcp2, firefox's neqo and chromium's console clients: | |
194 | |
195 $ examples/client 127.0.0.1 8443 https://example.com:8443/index.html | |
196 | |
197 $ ./neqo-client https://127.0.0.1:8443/ | |
198 | |
199 $ chromium-build/out/my_build/quic_client http://example.com:8443 \ | |
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200 --quic_version=h3-29 \ |
8366 | 201 --allow_unknown_root_cert \ |
202 --disable_certificate_verification | |
203 | |
204 | |
205 If you've got it right, in the access log you should see something like: | |
206 | |
207 127.0.0.1 - - [24/Apr/2020:11:27:29 +0300] "GET / HTTP/3" 200 805 "-" | |
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208 "nghttp3/ngtcp2 client" "quic" |
8366 | 209 |
210 | |
211 5. Troubleshooting | |
212 | |
213 Here are some tips that may help you to identify problems: | |
214 | |
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215 + Ensure you are building with proper SSL library that supports QUIC |
8366 | 216 |
217 + Ensure you are using the proper SSL library in runtime | |
218 (`nginx -V` will show you what you are using) | |
219 | |
220 + Ensure your client is actually sending QUIC requests | |
221 (see "Clients" section about browsers and cache) | |
222 | |
223 We recommend to start with simple console client like ngtcp2 | |
224 to ensure you've got server configured properly before trying | |
8395 | 225 with real browsers that may be very picky with certificates, |
8366 | 226 for example. |
227 | |
228 + Build nginx with debug support [7] and check your debug log. | |
229 It should contain all details about connection and why it | |
230 failed. All related messages contain "quic " prefix and can | |
231 be easily filtered out. | |
232 | |
233 + If you want to investigate deeper, you may want to enable | |
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234 additional debugging in src/event/quic/ngx_event_quic_connection.h: |
8366 | 235 |
236 #define NGX_QUIC_DEBUG_PACKETS | |
237 #define NGX_QUIC_DEBUG_FRAMES | |
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238 #define NGX_QUIC_DEBUG_ALLOC |
8366 | 239 #define NGX_QUIC_DEBUG_CRYPTO |
240 | |
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241 6. Contributing |
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242 |
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243 If you are willing to contribute, please refer to |
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244 http://nginx.org/en/docs/contributing_changes.html |
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245 |
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246 7. Links |
8366 | 247 |
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248 [1] https://datatracker.ietf.org/doc/html/rfc9000 |
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249 [2] https://datatracker.ietf.org/doc/html/draft-ietf-quic-http |
8366 | 250 [3] https://mailman.nginx.org/mailman/listinfo/nginx-devel |
251 [4] https://boringssl.googlesource.com/boringssl/ | |
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252 [5] https://datatracker.ietf.org/doc/html/rfc9002 |
8366 | 253 [6] https://nginx.org/en/docs/http/ngx_http_core_module.html#listen |
254 [7] https://nginx.org/en/docs/debugging_log.html | |
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255 [8] http://vger.kernel.org/lpc_net2018_talks/willemdebruijn-lpc2018-udpgso-paper-DRAFT-1.pdf |