diff --git a/src/main/java/com/imyeyu/network/ProgressiveRequest.java b/src/main/java/com/imyeyu/network/ProgressiveRequest.java
index dfb37da..0417104 100644
--- a/src/main/java/com/imyeyu/network/ProgressiveRequest.java
+++ b/src/main/java/com/imyeyu/network/ProgressiveRequest.java
@@ -4,10 +4,7 @@ import com.imyeyu.io.IO;
 import com.imyeyu.java.TimiJava;
 import org.apache.hc.client5.http.fluent.Request;
 import org.apache.hc.client5.http.fluent.Response;
-import org.apache.hc.core5.http.Header;
 import org.apache.hc.core5.http.HttpEntity;
-import org.apache.hc.core5.http.HttpResponse;
-import org.apache.hc.core5.http.ProtocolException;
 import org.apache.hc.core5.http.io.HttpClientResponseHandler;
 import org.apache.hc.core5.http.io.entity.EntityUtils;
 
@@ -24,24 +21,27 @@ import java.nio.file.Path;
  * @author 夜雨
  * @since 2025-06-26 13:03
  */
-public class ProgressiveRequest {
+public class ProgressiveRequest extends FileRequest {
 
-	private final Request request;
-	private final ProgressiveCallback callback;
+	protected final ProgressiveCallback callback;
 
-	private ProgressiveRequest(Request request, ProgressiveCallback callback) {
-		this.request = request;
+	protected ProgressiveRequest(Request request, ProgressiveCallback callback) {
+		super(request);
 		this.callback = callback;
 	}
 
-	public static ProgressiveRequest wrap(Request request) {
-		return new ProgressiveRequest(request, null);
-	}
-
 	public static ProgressiveRequest wrap(Request request, ProgressiveCallback callback) {
 		return new ProgressiveRequest(request, callback);
 	}
 
+	public static ProgressiveRequest get(String url, ProgressiveCallback callback) {
+		return new ProgressiveRequest(Request.get(url), callback);
+	}
+
+	public static ProgressiveRequest post(String url, ProgressiveCallback callback) {
+		return new ProgressiveRequest(Request.post(url), callback);
+	}
+
 	public void toFile(Path outputPath) throws IOException, NoPermissionException {
 		processResponse(request.execute(), IO.getOutputStream(outputPath.toFile()));
 	}
@@ -50,25 +50,17 @@ public class ProgressiveRequest {
 		processResponse(request.execute(), IO.getOutputStream(file));
 	}
 
+	@Override
+	public String asString() throws IOException {
+		return new String(asBytes());
+	}
+
 	public byte[] asBytes() throws IOException {
 		ByteArrayOutputStream os = new ByteArrayOutputStream();
 		processResponse(request.execute(), os);
 		return os.toByteArray();
 	}
 
-	public long length() throws IOException, ProtocolException {
-		HttpResponse response = request.execute().returnResponse();
-		final int status = response.getCode();
-		if (status < 200 || 300 <= status) {
-			throw new IOException("HTTP error status: " + status);
-		}
-		final Header contentLengthHeader = response.getHeader("Content-Length");
-		if (contentLengthHeader == null) {
-			throw new IOException("Content-Length header missing");
-		}
-		return Long.parseLong(contentLengthHeader.getValue());
-	}
-
 	private void processResponse(Response response, OutputStream os) throws IOException {
 		response.handleResponse((HttpClientResponseHandler<Void>) resp -> {
 			HttpEntity entity = resp.getEntity();