Issues with HttpProxy

[svonmiller]

Greetings,

We're using version 8. I must be confused about the HttpProxy. Whenver I set a datasource url to an external datasource, just like in the RSS example, I get a transport 404 error with "(via proxy:" and the name of my server. I've looked through the docs and I don't see any special settings that I need for an outside URL to work. Why can't I use outside URLs for a data source?

isc.DataSource.create({
    ID: "newsFeed",
    showPrompt:false,
    dataURL: "http://www.propertycasualty360.com/?f=rss",
    recordXPath: "/channel/item",
    dataFormat:"xml",
    fields: [
        { name: "pubDate", width:150, type:"date", align:"left" },
        { name: "title", title:"Headline", type:"text", width:500, showHover:true},
        { name: "description", title:"Description", type:"text", width:500, showHover:true},
        { name: "link_content", valueXPath:"guid", type:"text", hidden:true}
    ]
});

http://vkurapati.highlinedata.com:81/iap/include/isomorphic/HttpProxy), response: {status: -90,
data: "Transport error - HTTP code: 404 for URL..."[166],
httpResponseCode: 404,
transactionNum: 5,
clientContext: Obj,
context: Obj,
startRow: 0,
endRow: 0,
totalRows: 0}

[Isomorphic]

On the server, web.xml specifies which URL is handled by the HttpProxyServlet.
By default this is set to /isomorphic/HttpProxy/*.

On the client side, the proxy URL is put together by isomorphicDir and appending "HttpProxy". If you've modified your isomorphicDir, you may need to update the web.xml to match - in this case it looks like /iap/include/isomorphic/HttpProxy/* should do it.

[svonmiller]

Yes I had checked web.xml before posting, but I double checked it again and everything seems set properly (and like the other web.xml settings). I interpreted the message as coming from the httpproxyservlet, rather than tomcat, but maybe it's tomcat. In any case, it just won't work. I've tried /iap/include/isomorphic/HttpProxy/* (although this shouldn't work because the mapping doesn't need iap)
I've also tried
/include/isomorphic/HttpProxy/*
and
/include/isomorphic/HttpProxy

Here is the message:

Transport error - HTTP code: 404 for URL: http://feeds.feedburner.com/NationalUnderwriterLifeAndHealthBreakingNews (via proxy: http://vkurapati.highlinedata.com:81/iap/include/isomorphic/HttpProxy)

And here is the web.xml (including IDACall for comparison)

    <servlet>
        <servlet-name>IDACall</servlet-name>
        <servlet-class>com.isomorphic.servlet.IDACall</servlet-class>
    </servlet>
  <servlet>
   <servlet-name>HttpProxyServlet</servlet-name>
   <servlet-class>com.isomorphic.servlet.HttpProxyServlet</servlet-class>
  </servlet>

    <servlet-mapping>
        <servlet-name>IDACall</servlet-name>
        <url-pattern>/include/isomorphic/IDACall</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>HttpProxyServlet</servlet-name>
        <url-pattern>/include/isomorphic/HttpProxy/*</url-pattern>
    </servlet-mapping>

Any ideas?

[Isomorphic]

It does indeed look like your proxy is installed correctly and is working. This means the target URL is really returning 404. If you don't get the same result with a browser, consider if this may because when going through the proxy, the HTTP request is coming *from the server* not from your browser. This means it will not contain cookies, may resolve site URLs differently, or may be subject to different security rules (eg firewalls).

[Isomorphic]

In fact, a likely possibility is that your browser has proxy settings that allow it to bypass a firewall whereas the server does not have such settings. You can provide proxy settings to the HTTPProxy via web.xml settings - see the JavaDoc for the class for specific settings.