红帽全球峰会4.5.4. 更新 Access Log Header Pattern
从 JBoss EAP 6.4 迁移到 JBoss EAP 7 时，您可能会发现访问日志不再编写预期的"Referer"和"User-agent"值。这是因为 JBoss EAP 6.4 中包含的 JBoss Web 使用 access-log 中的 %{headername}i 模式来记录传入的标头。
示例：访问 JBoss EAP 6.4 中的日志格式
<access-log pattern="%h %l %u %t "%T sec" "%r" %s %b "%{Referer}i" "%{User-agent}i""/>
<access-log pattern="%h %l %u %t "%T sec" "%r" %s %b "%{Referer}i" "%{User-agent}i""/>
随着在 JBoss EAP 7 中使用 Undertow 的更改，传入标头的模式已更改为 %{i,headername}。
示例：JBoss EAP 7 中的访问格式标头
<access-log pattern="%h %l %u %t "%T sec" "%r" %s %b "%{i,Referer}" "%{i,User-Agent}""/>
<access-log pattern="%h %l %u %t "%T sec" "%r" %s %b "%{i,Referer}" "%{i,User-Agent}""/>
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