我试图对以下网址进行GET HTTP请求。https:/xml.betfred.comhorse-racing-us.xml。
使用Apache或OKHTTP时,我的Java代码会被阻止,但在Postman中每次都能正常工作,不需要任何额外的头信息等。
我从我的代码中得到的回答是:"为什么它在Postman中可以工作,而在其他地方却不行?
Response{protocol=http/1.1, code=405, message=Not Allowed, url=https://xml.betfred.com/horse-racing-us.xml}
为什么在Postman中可以工作,而在其他地方却不行?
String URL = "https://xml.betfred.com/horse-racing-us.xml";
HashMap<String, String> headers = new HashMap<String, String>();
headers.put("Cache-Control", "no-cache");
headers.put("User-Agent", "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36");
headers.put("Connection", "keep-alive");
headers.put("accept", "application/json");
JSONObject object = null;
try {
object = JSONHelper.readJsonFromUrl(URL, headers);
} catch (JSONException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
public static JSONObject readJsonFromUrl(String urlString, HashMap<String, String> headers) throws IOException, JSONException {
HttpURLConnection urlConnection = null;
URL url = new URL(urlString);
urlConnection = (HttpURLConnection) url.openConnection();
Iterator<Entry<String, String>> it = headers.entrySet().iterator();
while (it.hasNext()) {
Map.Entry<String, String> pair = (Map.Entry<String, String>)it.next();
urlConnection.setRequestProperty(pair.getKey(), pair.getValue());
}
urlConnection.setReadTimeout(10000 /* milliseconds */ );
urlConnection.setConnectTimeout(15000 /* milliseconds */ );
urlConnection.setDoOutput(true);
urlConnection.connect();
BufferedReader br = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
StringBuilder sb = new StringBuilder();
String line;
while ((line = br.readLine()) != null) {
sb.append(line + "\n");
}
br.close();
String jsonString = sb.toString();
urlConnection.disconnect();
return new JSONObject(jsonString);
}
这条信息表明,HTTP版本1.1的GET方法是不允许的。
它看起来像一个版本不匹配。该网站支持HTTP版本2,当你在浏览器中打开它。你可以尝试替换Java的内置的 HttpUrlConnection
因为OkHttp支持HTTP版本2。你必须升级你的JVM。在我的JVM(build 1.8.0_241-b07)中,当我运行这段代码时,HTTP版本2被选择了。