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2012年9月28日 星期五

Android 開發筆記 - 解決 HttpUriRequest/HttpGet/HttpPost 之 Host name may not be null

最近碰到一個 bug 卡關,那就是當我 new HttpGet("http://aaa_bbb.ccc.dddd") 出來,交由 HttpClient 執行時,卻會看到以下訊息:


java.lang.IllegalArgumentException: Host name may not be null
org.apache.http.HttpHost.<init>(HttpHost.java:83)
org.apache.http.impl.client.AbstractHttpClient.determineTarget(AbstractHttpClient.java:497)
org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)


當下讓我連問隔壁的同事幾次...難道 hostname 不能有底線?改成 new HttpGet("aaa_bbb.ccc.dddd") 則是:


java.lang.IllegalStateException: Target host must not be null, or set in parameters.
org.apache.http.impl.client.DefaultRequestDirector.determineRoute(DefaultRequestDirector.java:561)
org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:292)
org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)


原始程式碼:


String target = "http://aaa_bbb.ccc.dddd";


HttpClient mClient = new DefaultHttpClient();
HttpContext mHttpContext = new BasicHttpContext();
HttpUriRequest mHttpUriRequest = new HttpGet(target);
response = mClient.execute(mHttpUriRequest, mHttpContext);


解法:


String hostname = "aaa_bbb.ccc.dddd";
String target = "http://"+hostname;


HttpClient mClient = new DefaultHttpClient();
HttpContext mHttpContext = new BasicHttpContext();
HttpUriRequest mHttpUriRequest = new HttpGet(target);
response = mClient.execute(new HttpHost(hostname), mHttpUriRequest, mHttpContext);


不曉得這是不是一個 framework 的 bug?還是單純我操作錯誤呢...暫時先這樣解掉吧。


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