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    公司之前用的是http，但是出於蘋果app稽核和伺服器安全性問題，要改為https，我們公司用的是沃通的ssl，按照沃通的官方文件提供的步驟完成伺服器的配置。 架構上使用了 Nginx +tomcat 叢集, 且nginx下配置了SSL,tomcat 沒有配置SSL,專案使用https協議。

配置成功後明明是https url請求,發現 log裡面，tomcat獲取scheme的時候，一直是http，而不是想像中的https

0415 16:01:10 INFO  (PaymentInterceptor.java:44) preHandle() - requestStringForLog:    {
        "request.getRequestURL():": "http://m.xxx.com/payment/paymentChannel?id=212&s=a84485e0985afe97fffd7fd7741c93851d83a4f6",
        "request.getMethod:": "GET",
        "_parameterMap":         {
            "id": ["212"],
            "s": ["a84485e0985afe97fffd7fd7741c93851d83a4f6"]
        }
    }
 

http://m.xxx.com/payment/paymentChannel?id=212&s=a84485e0985afe97fffd7fd7741c93851d83a4f6 

但是瀏覽器中的URL卻是 

https://m.xxx.com/payment/paymentChannel?id=212&s=a84485e0985afe97fffd7fd7741c93851d83a4f6

下面我們進一步研究發現，java API上寫得很清楚:

getRequestURL():

Reconstructs the URL the client used to make the request. 

The returned URL contains a protocol, server name, port number, and server path, 
but it does not include query string parameters.
 

並且還發現

request.getScheme()  //總是 http，而不是實際的http或https
request.isSecure()  //總是false（因為總是http）
request.getRemoteAddr()  //總是 nginx 請求的 IP，而不是使用者的IP
request.getRequestURL()  //總是 nginx 請求的URL 而不是使用者實際請求的 URL
response.sendRedirect( 相對url )  //總是重定向到 http 上 （因為認為當前是 http 請求）
 

1.配置nginx的轉發項，配置檔案為proxy.conf，內容如下：

proxy_connect_timeout 300s;
proxy_send_timeout 900;
proxy_read_timeout 900;
proxy_buffer_size 32k;
proxy_buffers 4 64k;
proxy_busy_buffers_size 128k;
proxy_redirect off;
proxy_hide_header Vary;
proxy_set_header Accept-Encoding '';
proxy_set_header Referer $http_referer;
proxy_set_header Cookie $http_cookie;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

proxy_set_header X-Forwarded-Proto  $scheme;

2.配置tomcat，配置檔案為server.xml，內容如下：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE server-xml [
<!ENTITY vhost-localhost SYSTEM "file:///usr/local/tomcat-interface/conf/vhost/localhost.xml">
]>
<Server port="8006" shutdown="SHUTDOWN">
  <Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener"/>
  <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener"/>
  <Listener className="org.apache.catalina.core.ThreadLocalLeakPreventionListener"/>
  <Listener className="org.apache.catalina.core.AprLifecycleListener"/>

  <GlobalNamingResources>
    <Resource name="UserDatabase" auth="Container"
              type="org.apache.catalina.UserDatabase"
              description="User database that can be updated and saved"
              factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
              pathname="conf/tomcat-users.xml" />
  </GlobalNamingResources>

  <Service name="Catalina">
    <Connector port="8080"
              protocol="org.apache.coyote.http11.Http11AprProtocol"
              connectionTimeout="20000"
              redirectPort="8443"
              maxThreads="1000"
              minSpareThreads="20"
              acceptCount="1000"
              debug="0"
              disableUploadTimeout="true"
	      useBodyEncodingForURI="true"
              enableLookups="false"
              URIEncoding="UTF-8" />
    <Engine name="Catalina" defaultHost="localhost">
	  <Valve className="org.apache.catalina.valves.RemoteIpValve"
		remoteIpHeader="X-Forwarded-For"
		protocolHeader="X-Forwarded-Proto"
		protocolHeaderHttpsValue="https"/>
      <Realm className="org.apache.catalina.realm.LockOutRealm">
        <Realm className="org.apache.catalina.realm.UserDatabaseRealm"
               resourceName="UserDatabase"/>
      </Realm>
      &vhost-localhost;
    </Engine>
  </Service>
</Server>

<Valve className="org.apache.catalina.valves.RemoteIpValve"
remoteIpHeader="X-Forwarded-For"
protocolHeader="X-Forwarded-Proto"
protocolHeaderHttpsValue="https"/>

配置雙方的 X-Forwarded-Proto 就是為了正確地識別實際使用者發出的協議是 http 還是 https。 

配置完成之後以下的請求訪問

request.getScheme() 、request.isSecure() 、request.getRemoteAddr()、request.getRequestURL() 、response.sendRedirect( 相對url ) 

就都變為正確的結果了，就像使用者在直接訪問 Tomcat 一樣。

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