查看OpenLayers代码时遇到了这个参数，参考官方文档说明之。引自:http://trac.osgeo.org/openlayers/wiki/FrequentlyAskedQuestions#ProxyHost

ProxyHost

Why do I need a ProxyHost?

Due to security restrictions in Javascript, it is not possible to retrieve information from remote domains via an XMLHttpRequest.

Classes like WFS and GeoRSS use XMLHTTPRequest to
get their data. If they are querying a remote server (anything other than the machine hosting your page), you must install a proxy script somewhere web accessible on that machine. See below for how to set up your own ProxyHost.

If the OpenLayers.ProxyHost variable is not set to a valid proxy host, requests are sent directly to the remote servers. In most cases, the result will be a security exception, although this exception often occurs silently.

How do I set up a ProxyHost?

An example proxy host script is available here: trunk/openlayers/examples/proxy.cgi

For the standard Apache configuration, you would place proxy.cgi into your /usr/lib/cgi-bin/ directory.

Once a proxy host script has been installed, you must then edit the OpenLayers.ProxyHost variable to match that URL.

Given the above standard Apache configuration:

    OpenLayers.ProxyHost = "/cgi-bin/proxy.cgi?url=";

If you have done something like this, you should be able to visit:

 http://YourDomain.example.com/cgi-bin/proxy.cgi

The resulting content at that page should be the openlayers.org website.

If you get a 404 error instead, either the proxy script is not in the right location, or your webserver is not configured correctly.

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转载自：https://blog.csdn.net/cnhome/article/details/7835731