[FE] [HttpServer] Config netty param in HttpServer (#4225)

Now, if the length of URL is longer than 4096 bytes, netty will refuse.
The case can be reproduced by constructing a very long URL(longer than 4096bytes)

Add 2 http server params:
1. http_max_line_length
2. http_max_header_size

docs/en/administrator-guide/config/fe_config.md

@@ -333,6 +333,16 @@ This variable is a dynamic configuration, and users can modify the configuration
 
 ### `http_port`
 
+HTTP bind port. Defaults to 8030.
+
+### `http_max_line_length`
+
+The max length of an HTTP URL. The unit of this configuration is BYTE. Defaults to 4096.
+
+### `http_max_header_size`
+
+The max size of allowed HTTP headers. The unit of this configuration is BYTE. Defaults to 8192.
+
 ### `ignore_meta_check`
 
 ### `init_connect`

docs/zh-CN/administrator-guide/config/fe_config.md

@@ -331,6 +331,16 @@ FE 的配置项有两种方式进行配置：
 
 ### `http_port`
 
+HTTP服务监听的端口号，默认为8030
+
+### `http_max_line_length`
+
+HTTP服务允许接收请求的URL的最大长度，单位为比特，默认是4096
+
+### `http_max_header_size`
+
+HTTP服务允许接收请求的Header的最大长度，单位为比特，默认是8192
+
 ### `ignore_meta_check`
 
 ### `init_connect`

fe/fe-core/src/main/java/org/apache/doris/PaloFe.java

@@ -111,7 +111,12 @@ public class PaloFe {
             // 3. HttpServer for HTTP Server
             QeService qeService = new QeService(Config.query_port, Config.mysql_service_nio_enabled, ExecuteEnv.getInstance().getScheduler());
             FeServer feServer = new FeServer(Config.rpc_port);
-            HttpServer httpServer = new HttpServer(Config.http_port);
+            HttpServer httpServer = new HttpServer(
+                    Config.http_port,
+                    Config.http_max_line_length,
+                    Config.http_max_header_size,
+                    Config.http_max_chunk_size
+            );
             httpServer.setup();
 
             feServer.start();

fe/fe-core/src/main/java/org/apache/doris/common/Config.java

@@ -18,6 +18,7 @@
 package org.apache.doris.common;
 
 import org.apache.doris.PaloFe;
+import org.apache.doris.http.HttpServer;
 
 public class Config extends ConfigBase {
     
@@ -284,6 +285,15 @@ public class Config extends ConfigBase {
      */
     @ConfField public static int http_port = 8030;
 
+    /*
+     * Netty http param
+     */
+    @ConfField public static int http_max_line_length = HttpServer.DEFAULT_MAX_LINE_LENGTH;
+
+    @ConfField public static int http_max_header_size = HttpServer.DEFAULT_MAX_HEADER_SIZE;
+
+    @ConfField public static int http_max_chunk_size = HttpServer.DEFAULT_MAX_CHUNK_SIZE;
+
     /**
      * The backlog_num for netty http server
      * When you enlarge this backlog_num, you should ensure it's value larger than

fe/fe-core/src/main/java/org/apache/doris/http/HttpServer.java

@@ -94,7 +94,18 @@ import io.netty.handler.stream.ChunkedWriteHandler;
 
 public class HttpServer {
     private static final Logger LOG = LogManager.getLogger(HttpServer.class);
-    private int port;
+
+    /**
+     * The default netty param, witch is the same as `HttpServerCodec`.
+     */
+    public static final int DEFAULT_MAX_LINE_LENGTH = 4096;
+    public static final int DEFAULT_MAX_HEADER_SIZE = 8192;
+    public static final int DEFAULT_MAX_CHUNK_SIZE = 8192;
+
+    private final int port;
+    private final int maxInitialLineLength;
+    private final int maxHeaderSize;
+    private final int maxChunkSize;
     private ActionController controller;
 
     private Thread serverThread;
@@ -102,7 +113,14 @@ public class HttpServer {
     private AtomicBoolean isStarted = new AtomicBoolean(false);
 
     public HttpServer(int port) {
+        this(port, DEFAULT_MAX_LINE_LENGTH, DEFAULT_MAX_HEADER_SIZE, DEFAULT_MAX_CHUNK_SIZE);
+    }
+
+    public HttpServer(int port, int maxInitialLineLength, int maxHeaderSize, int maxChunkSize) {
         this.port = port;
+        this.maxInitialLineLength = maxInitialLineLength;
+        this.maxHeaderSize = maxHeaderSize;
+        this.maxChunkSize = maxChunkSize;
         controller = new ActionController();
     }
 
@@ -188,7 +206,7 @@ public class HttpServer {
     protected class PaloHttpServerInitializer extends ChannelInitializer<SocketChannel> {
         @Override
         protected void initChannel(SocketChannel ch) throws Exception {
-            ch.pipeline().addLast(new HttpServerCodec());
+            ch.pipeline().addLast(new HttpServerCodec(maxInitialLineLength, maxHeaderSize, maxChunkSize));
             ch.pipeline().addLast(new DorisHttpPostObjectAggregator(100 * 65536));
             ch.pipeline().addLast(new ChunkedWriteHandler());
             ch.pipeline().addLast(new HttpServerHandler(controller));