来自 Google App Engine 的 http 请求
我正在尝试从我的 Google App Engine Web 应用程序发出 http 请求，并发现我必须使用 URLConnection，因为它是唯一列入白名单的类。相应的 Clojure 库是 clojure.contrib.http.agent，我的代码如下：
(defroutes example
(GET "/" [] (http/string (http/http-agent "http://www.example.com")))
(route/not-found "Page not found"))
这在我的开发环境中运行良好 - 浏览器显示 example.com 的文本。但是当我使用 Google 的开发应用程序服务器对其进行测试时：
phrygian:example wei$ dev_appserver.sh war
2010-09-28 14:53:36.120 java[43845:903] [Java CocoaComponent compatibility mode]: Enabled
...
INFO: The server is running at http://localhost:8080/
当我加载页面时它就会挂起。没有错误，或者什么。知道会发生什么吗？
I'm trying to make http requests from my Google App Engine webapp, and discovered I have to use URLConnection since it's the only whitelisted class. The corresponding Clojure library is clojure.contrib.http.agent, and my code is as follows:
(defroutes example
(GET "/" [] (http/string (http/http-agent "http://www.example.com")))
(route/not-found "Page not found"))
This works fine in my development environment- the browser displays the text for example.com. But when I test it out with Google's development app server:
phrygian:example wei$ dev_appserver.sh war
2010-09-28 14:53:36.120 java[43845:903] [Java CocoaComponent compatibility mode]: Enabled
...
INFO: The server is running at http://localhost:8080/
It just hangs when I load the page. No error, or anything. Any idea what might be going on?
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http-agent创建线程，因此这可能是它不起作用的原因。来自 API 文档< /a>:
您可以尝试 http-connection，它是 HttpURLConnection 的包装器，所以这应该有效。
另一种选择是尝试 clj-http。该 API 似乎更高级一些，但它使用可能被列入黑名单的 Apache HttpComponents。
我猜测 http.async.client 由于其强大的异步性而绝对不能使用方法。
http-agentcreates threads so that might be why it does not work.From the API documentation:
You could try http-connection, which is a wrapper around HttpURLConnection, so this should work.
Another alternative is to try clj-http. The API seems to be a bit more high-level, but it uses Apache HttpComponents which might be blacklisted.
I am guessing http.async.client is a definite no-go due to its strong asynchronous approach.
您可能想尝试从 appengine-clj 中使用 appengine.urlfetch/fetch （http://github.com/r0man/appengine-clj，也在 clojars 中）
You might want to try appengine.urlfetch/fetch from appengine-clj (http://github.com/r0man/appengine-clj, also in clojars)