Java HttpURLConnection no es compatible con REPORT/PROPFIND - ¿qué debo hacer?

Question

HttpURLConnection solo admite cosas como GET, POST y HEAD, pero no REPORT/PROPFIND. Voy a implementar un CalDAV-Client pero sin estas operaciones (si quiero usarlas obtengo una ProtocolException) Tengo que escribir/entregar una biblioteca HTTP completa y enorme con auth, etc.

"Overkill".

¿Cómo envío solicitudes con PROPFIND e INFORME?

Answer 1

Probablemente desee buscar una biblioteca WebDAV, no una biblioteca HTTP, para esta.

Tal vez eche un vistazo a Apache Jackrabbit.

Answer 2

Se podría tratar de utilizar otra biblioteca HTTP, como Apache HTTP client y extender su HttpRequestBase (ver HttpGet y HttpPost por ejemplo).

Como alternativa, puede utilizar una biblioteca de cliente WebDAV directamente.

Answer 3

considerar el uso de Caldav4j

Es compatible con:

• fácil generación de informe solicita
• basado en httpclient 3.0
• aplicación Android
• migración actualmente a JackRabbit

Answer 4

Tuve un problema similar en WebDav para el método PROPFIND.

resuelto el problema mediante la implementación de esta solución: https://java.net/jira/browse/JERSEY-639

try { 
      httpURLConnection.setRequestMethod(method); 
     } catch (final ProtocolException pe) { 
      try { 
       final Class<?> httpURLConnectionClass = httpURLConnection 
         .getClass(); 
       final Class<?> parentClass = httpURLConnectionClass 
         .getSuperclass(); 
       final Field methodField; 
       // If the implementation class is an HTTPS URL Connection, we 
       // need to go up one level higher in the heirarchy to modify the 
       // 'method' field. 
       if (parentClass == HttpsURLConnection.class) { 
        methodField = parentClass.getSuperclass().getDeclaredField(
          "method"); 
       } else { 
        methodField = parentClass.getDeclaredField("method"); 
       } 
       methodField.setAccessible(true); 
       methodField.set(httpURLConnection, method); 
      } catch (final Exception e) { 
       throw new RuntimeException(e); 

      } 
    } 

Answer 5

O se puede utilizar https://github.com/square/okhttp

Código de ejemplo

// using OkHttp 
    public class PropFindExample {   
    private final OkHttpClient client = new OkHttpClient(); 
    String run(String url) throws IOException { 
     String credential = Credentials.basic(userName, password); 
     // body 
     String body = "<d:propfind xmlns:d=\"DAV:\" xmlns:cs=\"http://calendarserver.org/ns/\">\n" + 
       " <d:prop>\n" + 
       "  <d:displayname />\n" + 
       "  <d:getetag />\n" + 
       " </d:prop>\n" + 
       "</d:propfind>"; 
     Request request = new Request.Builder() 
       .url(url) 
       .method("PROPFIND", RequestBody.create(MediaType.parse(body), body)) 
       .header("DEPTH", "1") 
       .header("Authorization", credential) 
       .header("Content-Type", "text/xml") 
       .build(); 

     Response response = client.newCall(request).execute(); 
     return response.body().string(); 
    } 
} 

O jugar con sockets

Código de ejemplo

String host = "example.com"; 
int port = 443; 
String path = "/placeholder"; 
String userName = "username"; 
String password = "password"; 

SSLSocketFactory ssf = (SSLSocketFactory) SSLSocketFactory.getDefault(); 
Socket socket = ssf.createSocket(host, port); 
PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()))); 

// xml data to be sent in body 
String xmlData = "<?xml version=\"1.0\"?> <d:propfind xmlns:d=\"DAV:\" xmlns:cs=\"http://calendarserver.org/ns/\"> <d:prop> <d:displayname /> <d:getetag /> </d:prop> </d:propfind>"; 
// append headers 
out.println("PROPFIND path HTTP/1.1"); 
out.println("Host: "+host); 
String userCredentials = username+":"+password; 
String basicAuth = "Basic " + new String(Base64.encode(userCredentials.getBytes(), Base64.DEFAULT)); 
String authorization = "Authorization: " + basicAuth; 
out.println(authorization.trim()); 
out.println("Content-Length: "+ xmlData.length()); 
out.println("Content-Type: text/xml"); 
out.println("Depth: 1"); 
out.println(); 
// append body 
out.println(xmlData); 
out.flush(); 

// get response 
BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream())); 
String inputLine; 

System.out.println("--------------------------------------------------------"); 
System.out.println("---------------Printing response--------------------------"); 
System.out.println("--------------------------------------------------------"); 
while ((inputLine = in.readLine()) != null) { 
    System.out.println(inputLine); 
} 

in.close(); 

Answer 6

private static void setRequestMethod(HttpURLConnection conn, String method) throws Throwable { 
    try { 
     conn.setRequestMethod(method); 
    } catch (ProtocolException e) { 
     Class<?> c = conn.getClass(); 
     Field methodField = null; 
     Field delegateField = null; 
     try { 
      delegateField = c.getDeclaredField("delegate"); 
     } catch (NoSuchFieldException nsfe) { 

     } 
     while (c != null && methodField == null) { 
      try { 
       methodField = c.getDeclaredField("method"); 
      } catch (NoSuchFieldException nsfe) { 

      } 
      if (methodField == null) { 
       c = c.getSuperclass(); 
      } 
     } 
     if (methodField != null) { 
      methodField.setAccessible(true); 
      methodField.set(conn, method); 
     } 

     if (delegateField != null) { 
      delegateField.setAccessible(true); 
      HttpURLConnection delegate = (HttpURLConnection) delegateField.get(conn); 
      setRequestMethod(delegate, method); 
     } 
    } 
}