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annotate README @ 8997:fab36e4abf83 quic

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QUIC: got rid of hash symbol in backup and logging. Now all objectes with sequence number (i.e. sockets, connection ids and paths) are logged as "foo seq:N".
author Vladimir Homutov <vl@nginx.com>
date Fri, 28 Jan 2022 14:57:33 +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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20
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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