我想为tomlayer设置在tomcat上运行的代理，因此我遵循以下步骤：

1. 从OpenLayers网站下载了proxy.cgi文件：

http://trac.osgeo.org/openlayers/browser/trunk/openlayers/examples/proxy.cgi

这是代码：

#!c:/Python27/python.exe


"""This is a blind proxy that we use to get around browser
restrictions that prevent the Javascript from loading pages not on the
same server as the Javascript.  This has several problems: it's less
efficient, it might break some sites, and it's a security risk because
people can use this proxy to browse the web and possibly do bad stuff
with it.  It only loads pages via http and https, but it can load any
content type. It supports GET and POST requests."""

import urllib2
import cgi
import sys, os

# Designed to prevent Open Proxy type stuff.

allowedHosts = ['www.openlayers.org', 'openlayers.org', 
                'labs.metacarta.com', 'world.freemap.in', 
                'prototype.openmnnd.org', 'geo.openplans.org',
                'sigma.openplans.org', 'demo.opengeo.org',
                'www.openstreetmap.org', 'sample.azavea.com',
                'v2.suite.opengeo.org', 'v-swe.uni-muenster.de:8080', 
                'vmap0.tiles.osgeo.org', 'www.openrouteservice.org','localhost:6901']

method = os.environ["REQUEST_METHOD"]

if method == "POST":
    qs = os.environ["QUERY_STRING"]
    d = cgi.parse_qs(qs)
    if d.has_key("url"):
        url = d["url"][0]
    else:
        url = "http://www.openlayers.org"
else:
    fs = cgi.FieldStorage()
    url = fs.getvalue('url', "http://www.openlayers.org")

try:
    host = url.split("/")[2]
    if allowedHosts and not host in allowedHosts:
        print "Status: 502 Bad Gateway"
        print "Content-Type: text/plain"
        print
        print "This proxy does not allow you to access that location (%s)." % (host,)
        print
        print os.environ

    elif url.startswith("http://") or url.startswith("https://"):

        if method == "POST":
            length = int(os.environ["CONTENT_LENGTH"])
            headers = {"Content-Type": os.environ["CONTENT_TYPE"]}
            body = sys.stdin.read(length)
            r = urllib2.Request(url, body, headers)
            y = urllib2.urlopen(r)
        else:
            y = urllib2.urlopen(url)

        # print content type header
        i = y.info()
        if i.has_key("Content-Type"):
            print "Content-Type: %s" % (i["Content-Type"])
        else:
            print "Content-Type: text/plain"
        print

        print y.read()

        y.close()
    else:
        print "Content-Type: text/plain"
        print
        print "Illegal request."

except Exception, E:
    print "Status: 500 Unexpected Error"
    print "Content-Type: text/plain"
    print 
    print "Some unexpected error occurred. Error text was:", E

1. 我的tomcat位于端口6901，因此我修改了proxy.cgi文件，将我的域包括在allowedHosts列表中：

allowedHosts = [‘localhost：6901’]

1. 我将proxy.cgi文件复制到以下文件夹：

$ TOMCAT_PATH $ / webapps / myApp / WEB-INF / cgi /

1. 通过在以下位置添加文件下面的部分来修改Web应用程序的文件web.xml。

$ TOMCAT_PATH $ / webapps / myApp / WEB-INF / web.xml

<servlet> 
    <servlet-name>cgi</servlet-name> 
    <servlet-class>org.apache.catalina.servlets.CGIServlet</servlet-class> 
    <init-param> 
        <param-name>debug</param-name> 
        <param-value>0</param-value> 
    </init-param> 
    <init-param> 
        <param-name>cgiPathPrefix</param-name> 
        <param-value>WEB-INF/cgi</param-value> 
    </init-param> 
    <init-param> 
        <param-name>executable</param-name> 
        <param-value>c:\python25\python.exe</param-value> 
    </init-param> 
    <init-param> 
        <param-name>passShellEnvironment</param-name> 
        <param-value>true</param-value> 
    </init-param> 
    <load-on-startup>5</load-on-startup> 
</servlet>

<servlet-mapping> 
<servlet-name>cgi</servlet-name> 
<url-pattern>/cgi-bin/*</url-pattern> 
</servlet-mapping>

注释：“可执行”参数的“参数值”必须包含Pyhton安装的路径。（确实！）

1. 通过添加以下元素（位于）修改了我的Web应用程序的文件context.xml $TOMCAT_PATH$/webapps/myApp/META-INF/context.xml

2. 重新启动Tomcat

3. 要将代理与OpenLayers一起使用，请在代码中包含以下这一行：

OpenLayers.ProxyHost =“ /yourWebApp/cgi-bin/proxy.cgi?url=”;

但是代理不起作用！当我尝试使用它像：

/myApp/cgi-bin/proxy.cgi?url=labs.metacarta.com

我收到此错误：

Some unexpected error occurred. Error text was: list index out of range

我认为它与os.environ [“ REQUEST_METHOD”]相关，但我不知道它是如何相关的。