annotate README @ 8846:740e8b99519d quic

QUIC: improved size calculation in ngx_quic_write_chain(). Previously, size was calculated based on the number of input bytes processed by the function. Now only the copied bytes are considered. This prevents overlapping buffers from contributing twice to the overall written size.
author Roman Arutyunyan <arut@nginx.com>
date Thu, 03 Feb 2022 21:29:05 +0300
parents a7b789e2be27
children 0e74a77c2475
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1 Experimental QUIC support for nginx
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2 -----------------------------------
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3
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4 1. Introduction
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5 2. Installing
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6 3. Configuration
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7 4. Clients
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8 5. Troubleshooting
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9 6. Contributing
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10 7. Links
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11
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12 1. Introduction
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13
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14 This is an experimental QUIC [1] / HTTP/3 [2] support for nginx.
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15
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16 The code is developed in a separate "quic" branch available
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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.
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21 The project code base is under the same BSD license as nginx.
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22
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23 The code is currently at a beta level of quality and should not
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24 be used in production.
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25
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26 We are working on improving HTTP/3 support with the goal of
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27 integrating it to the main NGINX codebase. Expect frequent
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28 updates of this code and don't rely on it for whatever purpose.
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29
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30 We'll be grateful for any feedback and code submissions however
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31 we don't bear any responsibilities for any issues with this code.
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32
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33 You can always contact us via nginx-devel mailing list [3].
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34
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35 What works now:
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36
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37 We support IETF QUIC version 1. Internet drafts are no longer supported.
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38
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39 nginx should be able to respond to HTTP/3 requests over QUIC and
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40 it should be possible to upload and download big files without errors.
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41
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42 + The handshake completes successfully
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43 + One endpoint can update keys and its peer responds correctly
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44 + 0-RTT data is being received and acted on
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45 + Connection is established using TLS Resume Ticket
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46 + A handshake that includes a Retry packet completes successfully
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47 + Stream data is being exchanged and ACK'ed
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48 + An H3 transaction succeeded
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49 + One or both endpoints insert entries into dynamic table and
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50 subsequently reference them from header blocks
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51 + Version Negotiation packet is sent to client with unknown version
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52 + Lost packets are detected and retransmitted properly
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53 + Clients may migrate to new address
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54
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55 2. Installing
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56
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57 You will need a BoringSSL [4] library that provides QUIC support
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58
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59 $ hg clone -b quic https://hg.nginx.org/nginx-quic
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60 $ cd nginx-quic
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61 $ ./auto/configure --with-debug --with-http_v3_module \
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62 --with-cc-opt="-I../boringssl/include" \
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63 --with-ld-opt="-L../boringssl/build/ssl \
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64 -L../boringssl/build/crypto"
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65 $ make
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66
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67 Alternatively, nginx can be configured with QuicTLS [9]
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68
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69 $ ./auto/configure --with-debug --with-http_v3_module \
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70 --with-cc-opt="-I../quictls/build/include" \
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71 --with-ld-opt="-L../quictls/build/lib"
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72
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73 When configuring nginx, you can enable QUIC and HTTP/3 using the
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74 following new configuration options:
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75
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76 --with-http_v3_module - enable QUIC and HTTP/3
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77 --with-stream_quic_module - enable QUIC in Stream
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78
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79 3. Configuration
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80
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81 The HTTP "listen" directive got a new option "http3" which enables
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82 HTTP/3 over QUIC on the specified port.
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83
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84 The Stream "listen" directive got a new option "quic" which enables
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85 QUIC as client transport protocol instead of TCP or plain UDP.
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86
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87 Along with "http3" or "quic", you also have to specify "reuseport"
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88 option [6] to make it work properly with multiple workers.
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89
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90 To enable address validation:
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91
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92 quic_retry on;
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93
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94 To enable 0-RTT:
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95
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96 ssl_early_data on;
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97
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98 Make sure that TLS 1.3 is configured which is required for QUIC:
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99
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100 ssl_protocols TLSv1.3;
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101
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102 To enable GSO (Generic Segmentation Offloading):
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103
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104 quic_gso on;
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105
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106 To limit maximum packet size:
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107
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108 quic_mtu <size>;
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109
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110 To set host key for various tokens:
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111
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112 quic_host_key <filename>;
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113
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114
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115 By default this Linux-specific optimization [8] is disabled.
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116 Enable if your network interface is configured to support GSO.
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117
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118 A number of directives were added that configure HTTP/3:
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119
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120 http3_stream_buffer_size
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121 http3_max_concurrent_pushes
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122 http3_max_concurrent_streams
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123 http3_push
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124 http3_push_preload
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125 http3_hq (requires NGX_HTTP_V3_HQ macro)
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126
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127 In http, an additional variable is available: $http3.
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128 The value of $http3 is "h3" for HTTP/3 connections,
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129 "hq" for hq connections, or an empty string otherwise.
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130
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131 In stream, an additional variable is available: $quic.
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132 The value of $quic is "quic" if QUIC connection is used,
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133 or an empty string otherwise.
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134
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135 Example configuration:
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136
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137 http {
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138 log_format quic '$remote_addr - $remote_user [$time_local] '
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139 '"$request" $status $body_bytes_sent '
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140 '"$http_referer" "$http_user_agent" "$http3"';
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141
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142 access_log logs/access.log quic;
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143
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144 server {
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145 # for better compatibility it's recommended
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146 # to use the same port for quic and https
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147 listen 8443 http3 reuseport;
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148 listen 8443 ssl;
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149
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150 ssl_certificate certs/example.com.crt;
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151 ssl_certificate_key certs/example.com.key;
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152 ssl_protocols TLSv1.3;
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153
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154 location / {
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155 # required for browsers to direct them into quic port
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156 add_header Alt-Svc 'h3=":8443"; ma=86400';
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157 }
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158 }
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159 }
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160
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161 4. Clients
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162
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163 * Browsers
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164
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165 Known to work: Firefox 90+ and Chrome 92+ (QUIC version 1)
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166
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167 Beware of strange issues: sometimes browser may decide to ignore QUIC
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168 Cache clearing/restart might help. Always check access.log and
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169 error.log to make sure you are using HTTP/3 and not TCP https.
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170
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171 * Console clients
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172
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173 Known to work: ngtcp2, firefox's neqo and chromium's console clients:
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174
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175 $ examples/client 127.0.0.1 8443 https://example.com:8443/index.html
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176
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177 $ ./neqo-client https://127.0.0.1:8443/
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178
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179 $ chromium-build/out/my_build/quic_client http://example.com:8443
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180
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181
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182 If you've got it right, in the access log you should see something like:
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183
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184 127.0.0.1 - - [24/Apr/2020:11:27:29 +0300] "GET / HTTP/3" 200 805 "-"
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185 "nghttp3/ngtcp2 client" "quic"
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186
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187
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188 5. Troubleshooting
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189
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190 Here are some tips that may help you to identify problems:
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191
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192 + Ensure you are building with proper SSL library that supports QUIC
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193
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194 + Ensure you are using the proper SSL library in runtime
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195 (`nginx -V` will show you what you are using)
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196
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197 + Ensure your client is actually sending requests over QUIC
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198 (see "Clients" section about browsers and cache)
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199
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200 We recommend to start with simple console client like ngtcp2
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201 to ensure you've got server configured properly before trying
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202 with real browsers that may be very picky with certificates,
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203 for example.
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204
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205 + Build nginx with debug support [7] and check your debug log.
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206 It should contain all details about connection and why it
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207 failed. All related messages contain "quic " prefix and can
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208 be easily filtered out.
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209
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210 + If you want to investigate deeper, you may want to enable
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211 additional debugging in src/event/quic/ngx_event_quic_connection.h:
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212
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213 #define NGX_QUIC_DEBUG_PACKETS
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214 #define NGX_QUIC_DEBUG_FRAMES
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215 #define NGX_QUIC_DEBUG_ALLOC
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216 #define NGX_QUIC_DEBUG_CRYPTO
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217
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218 6. Contributing
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219
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220 If you are willing to contribute, please refer to
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221 http://nginx.org/en/docs/contributing_changes.html
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222
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223 7. Links
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224
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225 [1] https://datatracker.ietf.org/doc/html/rfc9000
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226 [2] https://datatracker.ietf.org/doc/html/draft-ietf-quic-http
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227 [3] https://mailman.nginx.org/mailman3/lists/nginx-devel.nginx.org/
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228 [4] https://boringssl.googlesource.com/boringssl/
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229 [5] https://datatracker.ietf.org/doc/html/rfc9002
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230 [6] https://nginx.org/en/docs/http/ngx_http_core_module.html#listen
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231 [7] https://nginx.org/en/docs/debugging_log.html
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232 [8] http://vger.kernel.org/lpc_net2018_talks/willemdebruijn-lpc2018-udpgso-paper-DRAFT-1.pdf
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233 [9] https://github.com/quictls/openssl