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+<tt>
+&lt;div&nbsp;dir=&quot;ltr&quot;&gt;&lt;div&gt;But&nbsp;then&nbsp;I&nbsp;would&nbsp;have&nbsp;to&nbsp;check&nbsp;the&nbsp;client&nbsp;cert&nbsp;for&nbsp;each&nbsp;and&nbsp;every&nbsp;request. &nbsp;I&nbsp;should&nbsp;have&nbsp;to&nbsp;check&nbsp;the&nbsp;cert&nbsp;only&nbsp;once&nbsp;at&nbsp;connect&nbsp;time&nbsp;and&nbsp;then&nbsp;be&nbsp;able&nbsp;to&nbsp;pass&nbsp;the&nbsp;result&nbsp;of&nbsp;that&nbsp;check&nbsp;in&nbsp;the&nbsp;request&nbsp;to&nbsp;each&nbsp;handler.&lt;br&gt;<br>
+&lt;br&gt;&lt;/div&gt;Anyway&nbsp;I&#39;ve&nbsp;gone&nbsp;ahead&nbsp;and&nbsp;implemented&nbsp;what&nbsp;I&nbsp;need&nbsp;in&nbsp;a&nbsp;generic&nbsp;manner&nbsp;and&nbsp;it&nbsp;seems&nbsp;to&nbsp;work&nbsp;well. &nbsp;I&nbsp;think&nbsp;it&nbsp;would&nbsp;be&nbsp;a&nbsp;useful&nbsp;addition&nbsp;to&nbsp;Cowboy. &nbsp;If&nbsp;you&nbsp;agree&nbsp;I&nbsp;could&nbsp;write&nbsp;some&nbsp;more&nbsp;documentation&nbsp;for&nbsp;it.&lt;br&gt;<br>
+&lt;div&gt;&lt;br&gt;&lt;a&nbsp;href=&quot;https://github.com/goertzenator/cowboy/tree/onconnect&quot;&gt;https://github.com/goertzenator/cowboy/tree/onconnect&lt;/a&gt;&lt;br&gt;&lt;br&gt;&lt;/div&gt;&lt;div&gt;I&nbsp;added&nbsp;a&nbsp;&quot;onconnect&quot;&nbsp;hook&nbsp;and&nbsp;&quot;connection&nbsp;metadata&quot;&nbsp;to&nbsp;cowboy_req. &nbsp;The&nbsp;connection&nbsp;metadata&nbsp;works&nbsp;like&nbsp;existing&nbsp;metadata,&nbsp;but&nbsp;is&nbsp;preserved&nbsp;from&nbsp;request&nbsp;to&nbsp;request&nbsp;on&nbsp;the&nbsp;same&nbsp;connection. &nbsp;The&nbsp;onconnect&nbsp;hook&nbsp;provides&nbsp;initial&nbsp;values&nbsp;for&nbsp;the&nbsp;connection&nbsp;metadata.&lt;br&gt;<br>
+&lt;br&gt;&lt;/div&gt;&lt;div&gt;Dan.&lt;br&gt;&lt;/div&gt;&lt;div&gt;&lt;br&gt;&lt;/div&gt;&lt;div&gt;&lt;br&gt;&lt;/div&gt;&lt;/div&gt;&lt;div&nbsp;class=&quot;gmail_extra&quot;&gt;&lt;br&gt;&lt;br&gt;&lt;div&nbsp;class=&quot;gmail_quote&quot;&gt;On&nbsp;Thu,&nbsp;Jun&nbsp;5,&nbsp;2014&nbsp;at&nbsp;3:04&nbsp;AM,&nbsp;Loïc&nbsp;Hoguin&nbsp;&lt;span&nbsp;dir=&quot;ltr&quot;&gt;&lt;&lt;a&nbsp;href=&quot;mailto:[email protected]&quot;&nbsp;target=&quot;_blank&quot;&gt;[email protected]&lt;/a&gt;&gt;&lt;/span&gt;&nbsp;wrote:&lt;br&gt;<br>
+&lt;blockquote&nbsp;class=&quot;gmail_quote&quot;&nbsp;style=&quot;margin:0&nbsp;0&nbsp;0&nbsp;.8ex;border-left:1px&nbsp;#ccc&nbsp;solid;padding-left:1ex&quot;&gt;&lt;div&nbsp;class=&quot;&quot;&gt;On&nbsp;06/05/2014&nbsp;01:44&nbsp;AM,&nbsp;Daniel&nbsp;Goertzen&nbsp;wrote:&lt;br&gt;<br>
+&lt;/div&gt;&lt;blockquote&nbsp;class=&quot;gmail_quote&quot;&nbsp;style=&quot;margin:0&nbsp;0&nbsp;0&nbsp;.8ex;border-left:1px&nbsp;#ccc&nbsp;solid;padding-left:1ex&quot;&gt;&lt;div&nbsp;class=&quot;&quot;&gt;<br>
+&lt;br&gt;<br>
+&lt;br&gt;<br>
+&lt;br&gt;<br>
+On&nbsp;Wed,&nbsp;Jun&nbsp;4,&nbsp;2014&nbsp;at&nbsp;4:48&nbsp;PM,&nbsp;Loïc&nbsp;Hoguin&nbsp;&lt;&lt;a&nbsp;href=&quot;mailto:[email protected]&quot;&nbsp;target=&quot;_blank&quot;&gt;[email protected]&lt;/a&gt;&lt;br&gt;&lt;/div&gt;&lt;div&nbsp;class=&quot;&quot;&gt;<br>
+&lt;mailto:&lt;a&nbsp;href=&quot;mailto:[email protected]&quot;&nbsp;target=&quot;_blank&quot;&gt;[email protected]&lt;/a&gt;&gt;&gt;&nbsp;wrote:&lt;br&gt;<br>
+&lt;br&gt;<br>
+ &nbsp; &nbsp;On&nbsp;06/04/2014&nbsp;10:08&nbsp;PM,&nbsp;Daniel&nbsp;Goertzen&nbsp;wrote:&lt;br&gt;<br>
+&lt;br&gt;<br>
+ &nbsp; &nbsp; &nbsp; &nbsp;I&nbsp;am&nbsp;having&nbsp;very&nbsp;good&nbsp;luck&nbsp;with&nbsp;Cowboy&nbsp;so&nbsp;far,&nbsp;but&nbsp;I&nbsp;have&nbsp;some&lt;br&gt;<br>
+ &nbsp; &nbsp; &nbsp; &nbsp;questions:&lt;br&gt;<br>
+&lt;br&gt;<br>
+ &nbsp; &nbsp; &nbsp; &nbsp;1.&nbsp;There&nbsp;doesn&#39;t&nbsp;appear&nbsp;to&nbsp;be&nbsp;any&nbsp;way&nbsp;to&nbsp;do&nbsp;client&nbsp;certificate&lt;br&gt;<br>
+ &nbsp; &nbsp; &nbsp; &nbsp;authorization&nbsp;in&nbsp;Cowboy,&nbsp;although&nbsp;I&nbsp;see&nbsp;there&nbsp;is&nbsp;an&nbsp;example&nbsp;for&lt;br&gt;<br>
+ &nbsp; &nbsp; &nbsp; &nbsp;doing&lt;br&gt;<br>
+ &nbsp; &nbsp; &nbsp; &nbsp;exactly&nbsp;that&nbsp;with&nbsp;Ranch.&nbsp; I&nbsp;think&nbsp;I&nbsp;could&nbsp;modify&nbsp;Cowboy&nbsp;to&nbsp;do&nbsp;what&nbsp;I&lt;br&gt;<br>
+ &nbsp; &nbsp; &nbsp; &nbsp;want,&nbsp;but&nbsp;I&nbsp;thought&nbsp;I&nbsp;would&nbsp;ask&nbsp;if&nbsp;there&nbsp;were&nbsp;other&nbsp;options&lt;br&gt;<br>
+ &nbsp; &nbsp; &nbsp; &nbsp;before&nbsp;doing&lt;br&gt;<br>
+ &nbsp; &nbsp; &nbsp; &nbsp;that.&lt;br&gt;<br>
+&lt;br&gt;<br>
+&lt;br&gt;<br>
+ &nbsp; &nbsp;Same&nbsp;as&nbsp;Ranch&nbsp;really,&nbsp;you&nbsp;just&nbsp;gotta&nbsp;take&nbsp;the&nbsp;socket&nbsp;and&nbsp;then&nbsp;call&lt;br&gt;<br>
+ &nbsp; &nbsp;the&nbsp;ssl&nbsp;functions.&lt;br&gt;<br>
+&lt;br&gt;<br>
+&lt;br&gt;<br>
+Yes,&nbsp;but&nbsp;in&nbsp;cowboy&nbsp;there&#39;s&nbsp;no&nbsp;API&nbsp;to&nbsp;get&nbsp;at&nbsp;the&nbsp;socket.&lt;br&gt;<br>
+&lt;/div&gt;&lt;/blockquote&gt;<br>
+&lt;br&gt;<br>
+There&nbsp;is&nbsp;the&nbsp;undocumented&nbsp;function&nbsp;cowboy_req:get/1&nbsp;which&nbsp;is&nbsp;meant&nbsp;for&nbsp;that&nbsp;kind&nbsp;of&nbsp;&quot;special&quot;&nbsp;use.&lt;div&nbsp;class=&quot;HOEnZb&quot;&gt;&lt;div&nbsp;class=&quot;h5&quot;&gt;&lt;br&gt;<br>
+&lt;br&gt;<br>
+--&nbsp;&lt;br&gt;<br>
+Loïc&nbsp;Hoguin&lt;br&gt;<br>
+&lt;a&nbsp;href=&quot;http://ninenines.eu&quot;&nbsp;target=&quot;_blank&quot;&gt;http://ninenines.eu&lt;/a&gt;&lt;br&gt;<br>
+&lt;/div&gt;&lt;/div&gt;&lt;/blockquote&gt;&lt;/div&gt;&lt;br&gt;&lt;/div&gt;<br>
+
+</tt>
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+<tt>
+&lt;div&nbsp;dir=&quot;ltr&quot;&gt;&lt;div&gt;But&nbsp;then&nbsp;I&nbsp;would&nbsp;have&nbsp;to&nbsp;check&nbsp;the&nbsp;client&nbsp;cert&nbsp;for&nbsp;each&nbsp;and&nbsp;every&nbsp;request. &nbsp;I&nbsp;should&nbsp;have&nbsp;to&nbsp;check&nbsp;the&nbsp;cert&nbsp;only&nbsp;once&nbsp;at&nbsp;connect&nbsp;time&nbsp;and&nbsp;then&nbsp;be&nbsp;able&nbsp;to&nbsp;pass&nbsp;the&nbsp;result&nbsp;of&nbsp;that&nbsp;check&nbsp;in&nbsp;the&nbsp;request&nbsp;to&nbsp;each&nbsp;handler.&lt;br&gt;<br>
+&lt;br&gt;&lt;/div&gt;Anyway&nbsp;I&#39;ve&nbsp;gone&nbsp;ahead&nbsp;and&nbsp;implemented&nbsp;what&nbsp;I&nbsp;need&nbsp;in&nbsp;a&nbsp;generic&nbsp;manner&nbsp;and&nbsp;it&nbsp;seems&nbsp;to&nbsp;work&nbsp;well. &nbsp;I&nbsp;think&nbsp;it&nbsp;would&nbsp;be&nbsp;a&nbsp;useful&nbsp;addition&nbsp;to&nbsp;Cowboy. &nbsp;If&nbsp;you&nbsp;agree&nbsp;I&nbsp;could&nbsp;write&nbsp;some&nbsp;more&nbsp;documentation&nbsp;for&nbsp;it.&lt;br&gt;<br>
+&lt;div&gt;&lt;br&gt;&lt;a&nbsp;href=&quot;https://github.com/goertzenator/cowboy/tree/onconnect&quot;&gt;https://github.com/goertzenator/cowboy/tree/onconnect&lt;/a&gt;&lt;br&gt;&lt;br&gt;&lt;/div&gt;&lt;div&gt;I&nbsp;added&nbsp;a&nbsp;&quot;onconnect&quot;&nbsp;hook&nbsp;and&nbsp;&quot;connection&nbsp;metadata&quot;&nbsp;to&nbsp;cowboy_req. &nbsp;The&nbsp;connection&nbsp;metadata&nbsp;works&nbsp;like&nbsp;existing&nbsp;metadata,&nbsp;but&nbsp;is&nbsp;preserved&nbsp;from&nbsp;request&nbsp;to&nbsp;request&nbsp;on&nbsp;the&nbsp;same&nbsp;connection. &nbsp;The&nbsp;onconnect&nbsp;hook&nbsp;provides&nbsp;initial&nbsp;values&nbsp;for&nbsp;the&nbsp;connection&nbsp;metadata.&lt;br&gt;<br>
+&lt;br&gt;&lt;/div&gt;&lt;div&gt;Dan.&lt;br&gt;&lt;/div&gt;&lt;div&gt;&lt;br&gt;&lt;/div&gt;&lt;div&gt;&lt;br&gt;&lt;/div&gt;&lt;/div&gt;&lt;div&nbsp;class=&quot;gmail_extra&quot;&gt;&lt;br&gt;&lt;br&gt;&lt;div&nbsp;class=&quot;gmail_quote&quot;&gt;On&nbsp;Thu,&nbsp;Jun&nbsp;5,&nbsp;2014&nbsp;at&nbsp;3:04&nbsp;AM,&nbsp;Loïc&nbsp;Hoguin&nbsp;&lt;span&nbsp;dir=&quot;ltr&quot;&gt;&lt;&lt;a&nbsp;href=&quot;mailto:[email protected]&quot;&nbsp;target=&quot;_blank&quot;&gt;[email protected]&lt;/a&gt;&gt;&lt;/span&gt;&nbsp;wrote:&lt;br&gt;<br>
+&lt;blockquote&nbsp;class=&quot;gmail_quote&quot;&nbsp;style=&quot;margin:0&nbsp;0&nbsp;0&nbsp;.8ex;border-left:1px&nbsp;#ccc&nbsp;solid;padding-left:1ex&quot;&gt;&lt;div&nbsp;class=&quot;&quot;&gt;On&nbsp;06/05/2014&nbsp;01:44&nbsp;AM,&nbsp;Daniel&nbsp;Goertzen&nbsp;wrote:&lt;br&gt;<br>
+&lt;/div&gt;&lt;blockquote&nbsp;class=&quot;gmail_quote&quot;&nbsp;style=&quot;margin:0&nbsp;0&nbsp;0&nbsp;.8ex;border-left:1px&nbsp;#ccc&nbsp;solid;padding-left:1ex&quot;&gt;&lt;div&nbsp;class=&quot;&quot;&gt;<br>
+&lt;br&gt;<br>
+&lt;br&gt;<br>
+&lt;br&gt;<br>
+On&nbsp;Wed,&nbsp;Jun&nbsp;4,&nbsp;2014&nbsp;at&nbsp;4:48&nbsp;PM,&nbsp;Loïc&nbsp;Hoguin&nbsp;&lt;&lt;a&nbsp;href=&quot;mailto:[email protected]&quot;&nbsp;target=&quot;_blank&quot;&gt;[email protected]&lt;/a&gt;&lt;br&gt;&lt;/div&gt;&lt;div&nbsp;class=&quot;&quot;&gt;<br>
+&lt;mailto:&lt;a&nbsp;href=&quot;mailto:[email protected]&quot;&nbsp;target=&quot;_blank&quot;&gt;[email protected]&lt;/a&gt;&gt;&gt;&nbsp;wrote:&lt;br&gt;<br>
+&lt;br&gt;<br>
+ &nbsp; &nbsp;On&nbsp;06/04/2014&nbsp;10:08&nbsp;PM,&nbsp;Daniel&nbsp;Goertzen&nbsp;wrote:&lt;br&gt;<br>
+&lt;br&gt;<br>
+ &nbsp; &nbsp; &nbsp; &nbsp;I&nbsp;am&nbsp;having&nbsp;very&nbsp;good&nbsp;luck&nbsp;with&nbsp;Cowboy&nbsp;so&nbsp;far,&nbsp;but&nbsp;I&nbsp;have&nbsp;some&lt;br&gt;<br>
+ &nbsp; &nbsp; &nbsp; &nbsp;questions:&lt;br&gt;<br>
+&lt;br&gt;<br>
+ &nbsp; &nbsp; &nbsp; &nbsp;1.&nbsp;There&nbsp;doesn&#39;t&nbsp;appear&nbsp;to&nbsp;be&nbsp;any&nbsp;way&nbsp;to&nbsp;do&nbsp;client&nbsp;certificate&lt;br&gt;<br>
+ &nbsp; &nbsp; &nbsp; &nbsp;authorization&nbsp;in&nbsp;Cowboy,&nbsp;although&nbsp;I&nbsp;see&nbsp;there&nbsp;is&nbsp;an&nbsp;example&nbsp;for&lt;br&gt;<br>
+ &nbsp; &nbsp; &nbsp; &nbsp;doing&lt;br&gt;<br>
+ &nbsp; &nbsp; &nbsp; &nbsp;exactly&nbsp;that&nbsp;with&nbsp;Ranch.&nbsp; I&nbsp;think&nbsp;I&nbsp;could&nbsp;modify&nbsp;Cowboy&nbsp;to&nbsp;do&nbsp;what&nbsp;I&lt;br&gt;<br>
+ &nbsp; &nbsp; &nbsp; &nbsp;want,&nbsp;but&nbsp;I&nbsp;thought&nbsp;I&nbsp;would&nbsp;ask&nbsp;if&nbsp;there&nbsp;were&nbsp;other&nbsp;options&lt;br&gt;<br>
+ &nbsp; &nbsp; &nbsp; &nbsp;before&nbsp;doing&lt;br&gt;<br>
+ &nbsp; &nbsp; &nbsp; &nbsp;that.&lt;br&gt;<br>
+&lt;br&gt;<br>
+&lt;br&gt;<br>
+ &nbsp; &nbsp;Same&nbsp;as&nbsp;Ranch&nbsp;really,&nbsp;you&nbsp;just&nbsp;gotta&nbsp;take&nbsp;the&nbsp;socket&nbsp;and&nbsp;then&nbsp;call&lt;br&gt;<br>
+ &nbsp; &nbsp;the&nbsp;ssl&nbsp;functions.&lt;br&gt;<br>
+&lt;br&gt;<br>
+&lt;br&gt;<br>
+Yes,&nbsp;but&nbsp;in&nbsp;cowboy&nbsp;there&#39;s&nbsp;no&nbsp;API&nbsp;to&nbsp;get&nbsp;at&nbsp;the&nbsp;socket.&lt;br&gt;<br>
+&lt;/div&gt;&lt;/blockquote&gt;<br>
+&lt;br&gt;<br>
+There&nbsp;is&nbsp;the&nbsp;undocumented&nbsp;function&nbsp;cowboy_req:get/1&nbsp;which&nbsp;is&nbsp;meant&nbsp;for&nbsp;that&nbsp;kind&nbsp;of&nbsp;&quot;special&quot;&nbsp;use.&lt;div&nbsp;class=&quot;HOEnZb&quot;&gt;&lt;div&nbsp;class=&quot;h5&quot;&gt;&lt;br&gt;<br>
+&lt;br&gt;<br>
+--&nbsp;&lt;br&gt;<br>
+Loïc&nbsp;Hoguin&lt;br&gt;<br>
+&lt;a&nbsp;href=&quot;http://ninenines.eu&quot;&nbsp;target=&quot;_blank&quot;&gt;http://ninenines.eu&lt;/a&gt;&lt;br&gt;<br>
+&lt;/div&gt;&lt;/div&gt;&lt;/blockquote&gt;&lt;/div&gt;&lt;br&gt;&lt;/div&gt;<br>
+
+</tt>
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+<tt>
+&lt;div&nbsp;dir=&quot;ltr&quot;&gt;Got&nbsp;it,&nbsp;thanks.&lt;div&gt;&lt;br&gt;&lt;/div&gt;&lt;div&gt;This&nbsp;&lt;a&nbsp;href=&quot;http://ninenines.eu/docs/en/cowboy/HEAD/manual/cowboy_rest/&quot;&gt;here&lt;/a&gt; had&nbsp;the&nbsp;fine&nbsp;print&nbsp;that&nbsp;I&nbsp;hadn&#39;t&nbsp;read&nbsp;apparently:&nbsp;&quot;This&nbsp;module&nbsp;cannot&nbsp;be&nbsp;described&nbsp;as&nbsp;a&nbsp;behaviour&nbsp;due&nbsp;to&nbsp;most&nbsp;of&nbsp;the&nbsp;callbacks&nbsp;it&nbsp;defines&nbsp;being&nbsp;optional.&nbsp;It&nbsp;has&nbsp;the&nbsp;same&nbsp;semantics&nbsp;as&nbsp;a&nbsp;behaviour&nbsp;otherwise.&lt;span&nbsp;style=&quot;color:rgb(51,51,51);font-family:&#39;Helvetica&nbsp;Neue&#39;,Helvetica,Arial,sans-serif;font-size:14px;line-height:19.600000381469727px&quot;&gt;&quot;&lt;/span&gt;&lt;/div&gt;<br>
+&lt;div&gt;&lt;span&nbsp;style=&quot;color:rgb(51,51,51);font-family:&#39;Helvetica&nbsp;Neue&#39;,Helvetica,Arial,sans-serif;font-size:14px;line-height:19.600000381469727px&quot;&gt;&lt;br&gt;&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span&nbsp;style=&quot;color:rgb(51,51,51);font-family:&#39;Helvetica&nbsp;Neue&#39;,Helvetica,Arial,sans-serif;font-size:14px;line-height:19.600000381469727px&quot;&gt;-&nbsp;Paulo&nbsp;F.&nbsp;Oliveira&lt;/span&gt;&lt;/div&gt;<br>
+&lt;/div&gt;&lt;div&nbsp;class=&quot;gmail_extra&quot;&gt;&lt;br&gt;&lt;br&gt;&lt;div&nbsp;class=&quot;gmail_quote&quot;&gt;On&nbsp;4&nbsp;June&nbsp;2014&nbsp;22:46,&nbsp;Loïc&nbsp;Hoguin&nbsp;&lt;span&nbsp;dir=&quot;ltr&quot;&gt;&lt;&lt;a&nbsp;href=&quot;mailto:[email protected]&quot;&nbsp;target=&quot;_blank&quot;&gt;[email protected]&lt;/a&gt;&gt;&lt;/span&gt;&nbsp;wrote:&lt;br&gt;&lt;blockquote&nbsp;class=&quot;gmail_quote&quot;&nbsp;style=&quot;margin:0&nbsp;0&nbsp;0&nbsp;.8ex;border-left:1px&nbsp;#ccc&nbsp;solid;padding-left:1ex&quot;&gt;<br>
+You&nbsp;shouldn&#39;t&nbsp;say&nbsp;-behavior(cowboy_http_handler)&nbsp;if&nbsp;you&nbsp;don&#39;t&nbsp;actually&nbsp;implement&nbsp;it.&lt;br&gt;<br>
+&lt;br&gt;<br>
+On&nbsp;06/04/2014&nbsp;11:37&nbsp;PM,&nbsp;Paulo&nbsp;F.&nbsp;Oliveira&nbsp;wrote:&lt;br&gt;<br>
+&lt;blockquote&nbsp;class=&quot;gmail_quote&quot;&nbsp;style=&quot;margin:0&nbsp;0&nbsp;0&nbsp;.8ex;border-left:1px&nbsp;#ccc&nbsp;solid;padding-left:1ex&quot;&gt;<br>
+Hello.&lt;br&gt;<br>
+&lt;br&gt;<br>
+You&nbsp;wrote&nbsp;here&lt;br&gt;<br>
+&lt;&lt;a&nbsp;href=&quot;http://ninenines.eu/docs/en/cowboy/HEAD/manual/cowboy_rest/&quot;&nbsp;target=&quot;_blank&quot;&gt;http://ninenines.eu/docs/en/&lt;u&gt;&lt;/u&gt;cowboy/HEAD/manual/cowboy_&lt;u&gt;&lt;/u&gt;rest/&lt;/a&gt;&gt;&nbsp;that&nbsp;&quot;The&lt;div&gt;&lt;div&nbsp;class=&quot;h5&quot;&gt;&lt;br&gt;<br>
+only&nbsp;mandatory&nbsp;callback&nbsp;is&nbsp;init/3,&nbsp;needed&nbsp;to&nbsp;perform&nbsp;the&nbsp;protocol&nbsp;upgrade.&quot;&lt;br&gt;<br>
+&lt;br&gt;<br>
+In&nbsp;my&nbsp;code&nbsp;I&nbsp;have&nbsp;only&nbsp;this&nbsp;function&nbsp;for&nbsp;the&nbsp;protocol&nbsp;upgrade:&lt;br&gt;<br>
+&lt;br&gt;<br>
+init({_TransportName,&nbsp;_ProtocolName},&nbsp;_Req,&nbsp;[])&nbsp;-&gt;&lt;br&gt;<br>
+ &nbsp; &nbsp; {upgrade,&nbsp;protocol,&nbsp;cowboy_rest}.&lt;br&gt;<br>
+&lt;br&gt;<br>
+On&nbsp;the&nbsp;other&nbsp;hand,&nbsp;when&nbsp;compiling,&nbsp;I&nbsp;get&nbsp;the&nbsp;following&nbsp;warnings:&lt;br&gt;<br>
+&lt;br&gt;<br>
+src/handler_transactions.erl:&lt;u&gt;&lt;/u&gt;3:&nbsp;Warning:&nbsp;undefined&nbsp;callback&nbsp;function&lt;br&gt;<br>
+handle/2&nbsp;(behaviour&nbsp;&#39;cowboy_http_handler&#39;)&lt;br&gt;<br>
+src/handler_transactions.erl:&lt;u&gt;&lt;/u&gt;3:&nbsp;Warning:&nbsp;undefined&nbsp;callback&nbsp;function&lt;br&gt;<br>
+terminate/3&nbsp;(behaviour&nbsp;&#39;cowboy_http_handler&#39;)&lt;br&gt;<br>
+&lt;br&gt;<br>
+Is&nbsp;this&nbsp;the&nbsp;expected&nbsp;behavior?&nbsp;I&nbsp;know&nbsp;I&nbsp;_can_&nbsp;ignore&nbsp;the&nbsp;warnings,&nbsp;but&lt;br&gt;<br>
+not&nbsp;if&nbsp;I&nbsp;want&nbsp;to&nbsp;use&nbsp;Erlang&nbsp;compiler&nbsp;option&nbsp;warnings_as_errors,&nbsp;for&nbsp;example.&lt;br&gt;<br>
+&lt;br&gt;<br>
+Many&nbsp;thanks.&lt;br&gt;<br>
+&lt;br&gt;<br>
+-&nbsp;Paulo&nbsp;F.&nbsp;Oliveira&lt;br&gt;<br>
+&lt;br&gt;<br>
+&lt;br&gt;&lt;/div&gt;&lt;/div&gt;<br>
+______________________________&lt;u&gt;&lt;/u&gt;_________________&lt;br&gt;<br>
+Extend&nbsp;mailing&nbsp;list&lt;br&gt;<br>
+&lt;a&nbsp;href=&quot;mailto:[email protected]&quot;&nbsp;target=&quot;_blank&quot;&gt;[email protected]&lt;/a&gt;&lt;br&gt;<br>
+&lt;a&nbsp;href=&quot;https://lists.ninenines.eu/listinfo/extend&quot;&nbsp;target=&quot;_blank&quot;&gt;https://lists.ninenines.eu/&lt;u&gt;&lt;/u&gt;listinfo/extend&lt;/a&gt;&lt;br&gt;<br>
+&lt;br&gt;&lt;span&nbsp;class=&quot;HOEnZb&quot;&gt;&lt;font&nbsp;color=&quot;#888888&quot;&gt;<br>
+&lt;/font&gt;&lt;/span&gt;&lt;/blockquote&gt;&lt;span&nbsp;class=&quot;HOEnZb&quot;&gt;&lt;font&nbsp;color=&quot;#888888&quot;&gt;<br>
+&lt;br&gt;<br>
+--&nbsp;&lt;br&gt;<br>
+Loïc&nbsp;Hoguin&lt;br&gt;<br>
+&lt;a&nbsp;href=&quot;http://ninenines.eu&quot;&nbsp;target=&quot;_blank&quot;&gt;http://ninenines.eu&lt;/a&gt;&lt;br&gt;<br>
+&lt;/font&gt;&lt;/span&gt;&lt;/blockquote&gt;&lt;/div&gt;&lt;br&gt;&lt;/div&gt;<br>
+
+</tt>
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+<tt>
+&lt;div&nbsp;dir=&quot;ltr&quot;&gt;Got&nbsp;it,&nbsp;thanks.&lt;div&gt;&lt;br&gt;&lt;/div&gt;&lt;div&gt;This&nbsp;&lt;a&nbsp;href=&quot;http://ninenines.eu/docs/en/cowboy/HEAD/manual/cowboy_rest/&quot;&gt;here&lt;/a&gt; had&nbsp;the&nbsp;fine&nbsp;print&nbsp;that&nbsp;I&nbsp;hadn&#39;t&nbsp;read&nbsp;apparently:&nbsp;&quot;This&nbsp;module&nbsp;cannot&nbsp;be&nbsp;described&nbsp;as&nbsp;a&nbsp;behaviour&nbsp;due&nbsp;to&nbsp;most&nbsp;of&nbsp;the&nbsp;callbacks&nbsp;it&nbsp;defines&nbsp;being&nbsp;optional.&nbsp;It&nbsp;has&nbsp;the&nbsp;same&nbsp;semantics&nbsp;as&nbsp;a&nbsp;behaviour&nbsp;otherwise.&lt;span&nbsp;style=&quot;color:rgb(51,51,51);font-family:&#39;Helvetica&nbsp;Neue&#39;,Helvetica,Arial,sans-serif;font-size:14px;line-height:19.600000381469727px&quot;&gt;&quot;&lt;/span&gt;&lt;/div&gt;<br>
+&lt;div&gt;&lt;span&nbsp;style=&quot;color:rgb(51,51,51);font-family:&#39;Helvetica&nbsp;Neue&#39;,Helvetica,Arial,sans-serif;font-size:14px;line-height:19.600000381469727px&quot;&gt;&lt;br&gt;&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span&nbsp;style=&quot;color:rgb(51,51,51);font-family:&#39;Helvetica&nbsp;Neue&#39;,Helvetica,Arial,sans-serif;font-size:14px;line-height:19.600000381469727px&quot;&gt;-&nbsp;Paulo&nbsp;F.&nbsp;Oliveira&lt;/span&gt;&lt;/div&gt;<br>
+&lt;/div&gt;&lt;div&nbsp;class=&quot;gmail_extra&quot;&gt;&lt;br&gt;&lt;br&gt;&lt;div&nbsp;class=&quot;gmail_quote&quot;&gt;On&nbsp;4&nbsp;June&nbsp;2014&nbsp;22:46,&nbsp;Loïc&nbsp;Hoguin&nbsp;&lt;span&nbsp;dir=&quot;ltr&quot;&gt;&lt;&lt;a&nbsp;href=&quot;mailto:[email protected]&quot;&nbsp;target=&quot;_blank&quot;&gt;[email protected]&lt;/a&gt;&gt;&lt;/span&gt;&nbsp;wrote:&lt;br&gt;&lt;blockquote&nbsp;class=&quot;gmail_quote&quot;&nbsp;style=&quot;margin:0&nbsp;0&nbsp;0&nbsp;.8ex;border-left:1px&nbsp;#ccc&nbsp;solid;padding-left:1ex&quot;&gt;<br>
+You&nbsp;shouldn&#39;t&nbsp;say&nbsp;-behavior(cowboy_http_handler)&nbsp;if&nbsp;you&nbsp;don&#39;t&nbsp;actually&nbsp;implement&nbsp;it.&lt;br&gt;<br>
+&lt;br&gt;<br>
+On&nbsp;06/04/2014&nbsp;11:37&nbsp;PM,&nbsp;Paulo&nbsp;F.&nbsp;Oliveira&nbsp;wrote:&lt;br&gt;<br>
+&lt;blockquote&nbsp;class=&quot;gmail_quote&quot;&nbsp;style=&quot;margin:0&nbsp;0&nbsp;0&nbsp;.8ex;border-left:1px&nbsp;#ccc&nbsp;solid;padding-left:1ex&quot;&gt;<br>
+Hello.&lt;br&gt;<br>
+&lt;br&gt;<br>
+You&nbsp;wrote&nbsp;here&lt;br&gt;<br>
+&lt;&lt;a&nbsp;href=&quot;http://ninenines.eu/docs/en/cowboy/HEAD/manual/cowboy_rest/&quot;&nbsp;target=&quot;_blank&quot;&gt;http://ninenines.eu/docs/en/&lt;u&gt;&lt;/u&gt;cowboy/HEAD/manual/cowboy_&lt;u&gt;&lt;/u&gt;rest/&lt;/a&gt;&gt;&nbsp;that&nbsp;&quot;The&lt;div&gt;&lt;div&nbsp;class=&quot;h5&quot;&gt;&lt;br&gt;<br>
+only&nbsp;mandatory&nbsp;callback&nbsp;is&nbsp;init/3,&nbsp;needed&nbsp;to&nbsp;perform&nbsp;the&nbsp;protocol&nbsp;upgrade.&quot;&lt;br&gt;<br>
+&lt;br&gt;<br>
+In&nbsp;my&nbsp;code&nbsp;I&nbsp;have&nbsp;only&nbsp;this&nbsp;function&nbsp;for&nbsp;the&nbsp;protocol&nbsp;upgrade:&lt;br&gt;<br>
+&lt;br&gt;<br>
+init({_TransportName,&nbsp;_ProtocolName},&nbsp;_Req,&nbsp;[])&nbsp;-&gt;&lt;br&gt;<br>
+ &nbsp; &nbsp; {upgrade,&nbsp;protocol,&nbsp;cowboy_rest}.&lt;br&gt;<br>
+&lt;br&gt;<br>
+On&nbsp;the&nbsp;other&nbsp;hand,&nbsp;when&nbsp;compiling,&nbsp;I&nbsp;get&nbsp;the&nbsp;following&nbsp;warnings:&lt;br&gt;<br>
+&lt;br&gt;<br>
+src/handler_transactions.erl:&lt;u&gt;&lt;/u&gt;3:&nbsp;Warning:&nbsp;undefined&nbsp;callback&nbsp;function&lt;br&gt;<br>
+handle/2&nbsp;(behaviour&nbsp;&#39;cowboy_http_handler&#39;)&lt;br&gt;<br>
+src/handler_transactions.erl:&lt;u&gt;&lt;/u&gt;3:&nbsp;Warning:&nbsp;undefined&nbsp;callback&nbsp;function&lt;br&gt;<br>
+terminate/3&nbsp;(behaviour&nbsp;&#39;cowboy_http_handler&#39;)&lt;br&gt;<br>
+&lt;br&gt;<br>
+Is&nbsp;this&nbsp;the&nbsp;expected&nbsp;behavior?&nbsp;I&nbsp;know&nbsp;I&nbsp;_can_&nbsp;ignore&nbsp;the&nbsp;warnings,&nbsp;but&lt;br&gt;<br>
+not&nbsp;if&nbsp;I&nbsp;want&nbsp;to&nbsp;use&nbsp;Erlang&nbsp;compiler&nbsp;option&nbsp;warnings_as_errors,&nbsp;for&nbsp;example.&lt;br&gt;<br>
+&lt;br&gt;<br>
+Many&nbsp;thanks.&lt;br&gt;<br>
+&lt;br&gt;<br>
+-&nbsp;Paulo&nbsp;F.&nbsp;Oliveira&lt;br&gt;<br>
+&lt;br&gt;<br>
+&lt;br&gt;&lt;/div&gt;&lt;/div&gt;<br>
+______________________________&lt;u&gt;&lt;/u&gt;_________________&lt;br&gt;<br>
+Extend&nbsp;mailing&nbsp;list&lt;br&gt;<br>
+&lt;a&nbsp;href=&quot;mailto:[email protected]&quot;&nbsp;target=&quot;_blank&quot;&gt;[email protected]&lt;/a&gt;&lt;br&gt;<br>
+&lt;a&nbsp;href=&quot;https://lists.ninenines.eu/listinfo/extend&quot;&nbsp;target=&quot;_blank&quot;&gt;https://lists.ninenines.eu/&lt;u&gt;&lt;/u&gt;listinfo/extend&lt;/a&gt;&lt;br&gt;<br>
+&lt;br&gt;&lt;span&nbsp;class=&quot;HOEnZb&quot;&gt;&lt;font&nbsp;color=&quot;#888888&quot;&gt;<br>
+&lt;/font&gt;&lt;/span&gt;&lt;/blockquote&gt;&lt;span&nbsp;class=&quot;HOEnZb&quot;&gt;&lt;font&nbsp;color=&quot;#888888&quot;&gt;<br>
+&lt;br&gt;<br>
+--&nbsp;&lt;br&gt;<br>
+Loïc&nbsp;Hoguin&lt;br&gt;<br>
+&lt;a&nbsp;href=&quot;http://ninenines.eu&quot;&nbsp;target=&quot;_blank&quot;&gt;http://ninenines.eu&lt;/a&gt;&lt;br&gt;<br>
+&lt;/font&gt;&lt;/span&gt;&lt;/blockquote&gt;&lt;/div&gt;&lt;br&gt;&lt;/div&gt;<br>
+
+</tt>