[英]HTTP Delete with Request Body issues
任何人都可以解释以下内容:
package com.foo.bar;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.ProtocolException;
import java.net.URL;
import org.springframework.util.FileCopyUtils;
public class ATest {
public static void main(String[] args) throws Exception {
try {
final String payload = "{\"parentExecutor\":\"foo1233\"}";
URL url = new URL("http://localhost/notes");
final HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("DELETE");
connection.setRequestProperty("Accept", "application/json");
connection.setRequestProperty("Content-Type", "application/json");
FileCopyUtils.copy(payload.getBytes(), connection.getOutputStream());
connection.connect();
final InputStream is = connection.getInputStream();
int b = is.read();
String result = "";
while (b != -1) {
result += (char) b;
b = is.read();
}
System.out.println(connection.getResponseCode());
System.out.println(result);
is.close();
}
catch (final ProtocolException e) {
e.printStackTrace();
}
}
}
上面的示例抛出以下异常:
java.net.ProtocolException: cannot write to a URLConnection if doOutput=false - call setDoOutput(true)
at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:995)
at com.foo.bar.ATest.main(ATest.java:24)
但是,如果我添加对setDoOutput(true)的调用, 则会引发以下异常:
java.net.ProtocolException: HTTP method DELETE doesn't support output
at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1004)
at com.foo.bar.ATest.main(ATest.java:25)
然后,如果我将协议从http更改为https,则不会引发异常,并且会从服务器获取预期的响应代码和内容。 我查看了源代码,可以跟踪调用并跟踪发生异常的位置,但是为什么可以通过HTTPS而不是HTTP发出这样的请求呢?
这是HttpURLConnection
的局限性(我认为这是一个Bug或至少是一个愚蠢的功能)。 在使用URLConnection
处理REST Web服务时,您不是唯一遇到此问题的人。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.