我想为openlayers设置一个在tomcat上运行的代理，所以我按照以下步骤操作：
- 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
我的 tomcat 位于端口 6901，因此我修改了 proxy.cgi 文件以将我的域包含在 allowedHosts 列表中：
allowedHosts = ['localhost:6901']
我将 proxy.cgi 文件复制到以下文件夹：
$TOMCAT_PATH$/webapps/myApp/WEB-INF/cgi/
修改了 web 应用程序的文件 web.xml，在文件下方添加了以下部分：
$TOMCAT_PATH$/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：“executable”参数的“param-value”必须包含 Pyhton 安装的路径。（确实如此！）
通过添加以下元素修改了我的 Web 应用程序的文件 context.xml，文件位于
$TOMCAT_PATH$/webapps/myApp/META-INF/context.xml重新启动Tomcat
要将代理与 OpenLayers 一起使用，请将这一行包含在代码中：
OpenLayers.ProxyHost = "/yourWebApp/cgi-bin/proxy.cgi?url=";
但是代理不起作用！当我尝试像这样使用它时：
/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"] 有关，但我不知道它是如何相关的。