A couple of rest bugfix

dubbo-plugin/dubbo-rest-jaxrs/src/main/java/org/apache/dubbo/rpc/protocol/tri/rest/support/jaxrs/HeaderParamArgumentResolver.java

@@ -43,6 +43,6 @@ protected Object resolveCollectionValue(NamedValueMeta meta, HttpRequest request
 
     @Override
     protected Object resolveMapValue(NamedValueMeta meta, HttpRequest request, HttpResponse response) {
-        return request.headers();
+        return request.headers().asMap();
     }
 }

dubbo-plugin/dubbo-rest-spring/src/main/java/org/apache/dubbo/rpc/protocol/tri/rest/support/spring/RequestHeaderArgumentResolver.java

@@ -43,6 +43,6 @@ protected Object resolveCollectionValue(NamedValueMeta meta, HttpRequest request
 
     @Override
     protected Object resolveMapValue(NamedValueMeta meta, HttpRequest request, HttpResponse response) {
-        return request.headers();
+        return request.headers().asMap();
     }
 }

dubbo-rpc/dubbo-rpc-triple/src/main/java/org/apache/dubbo/rpc/protocol/tri/h12/HttpContextCallbackFilter.java

@@ -29,7 +29,7 @@
 import org.apache.dubbo.rpc.RpcException;
 import org.apache.dubbo.rpc.protocol.tri.TripleConstants;
 
-@Activate(group = CommonConstants.PROVIDER, order = 29000)
+@Activate(group = CommonConstants.PROVIDER, order = 10)
 public class HttpContextCallbackFilter implements Filter, BaseFilter.Listener {
 
     @Override

dubbo-rpc/dubbo-rpc-triple/src/main/java/org/apache/dubbo/rpc/protocol/tri/rest/RestHttpMessageCodec.java

@@ -26,6 +26,7 @@
 import org.apache.dubbo.remoting.http12.message.HttpMessageEncoder;
 import org.apache.dubbo.remoting.http12.message.MediaType;
 import org.apache.dubbo.rpc.protocol.tri.rest.argument.ArgumentResolver;
+import org.apache.dubbo.rpc.protocol.tri.rest.argument.TypeConverter;
 import org.apache.dubbo.rpc.protocol.tri.rest.mapping.meta.ParameterMeta;
 
 import java.io.ByteArrayInputStream;
@@ -34,6 +35,7 @@
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.nio.charset.Charset;
+import java.util.Optional;
 
 public final class RestHttpMessageCodec implements HttpMessageDecoder, HttpMessageEncoder {
 
@@ -43,6 +45,7 @@ public final class RestHttpMessageCodec implements HttpMessageDecoder, HttpMessa
     private final HttpResponse response;
     private final ParameterMeta[] parameters;
     private final ArgumentResolver argumentResolver;
+    private final TypeConverter typeConverter;
     private final HttpMessageEncoder messageEncoder;
     private final Charset charset;
 
@@ -51,11 +54,13 @@ public RestHttpMessageCodec(
             HttpResponse response,
             ParameterMeta[] parameters,
             ArgumentResolver argumentResolver,
+            TypeConverter typeConverter,
             HttpMessageEncoder messageEncoder) {
         this.request = request;
         this.response = response;
         this.parameters = parameters;
         this.argumentResolver = argumentResolver;
+        this.typeConverter = typeConverter;
         this.messageEncoder = messageEncoder;
         charset = request.charsetOrDefault();
     }
@@ -106,6 +111,10 @@ private InputStream decodeInputStream(InputStream is) {
     public void encode(OutputStream os, Object data) throws EncodeException {
         if (data != null) {
             Class<?> type = data.getClass();
+            if (type == Optional.class) {
+                encode(os, ((Optional<?>) data).orElse(null));
+                return;
+            }
             try {
                 if (type == byte[].class) {
                     os.write((byte[]) data);
@@ -121,6 +130,9 @@ public void encode(OutputStream os, Object data) throws EncodeException {
                     }
                     return;
                 }
+                if (messageEncoder.mediaType().isPureText() && type != String.class) {
+                    data = typeConverter.convert(data, String.class);
+                }
             } catch (HttpStatusException e) {
                 throw e;
             } catch (Exception e) {

dubbo-rpc/dubbo-rpc-triple/src/main/java/org/apache/dubbo/rpc/protocol/tri/rest/mapping/RestRequestHandlerMapping.java

@@ -36,6 +36,8 @@
 import org.apache.dubbo.rpc.protocol.tri.rest.RestHttpMessageCodec;
 import org.apache.dubbo.rpc.protocol.tri.rest.argument.ArgumentResolver;
 import org.apache.dubbo.rpc.protocol.tri.rest.argument.CompositeArgumentResolver;
+import org.apache.dubbo.rpc.protocol.tri.rest.argument.GeneralTypeConverter;
+import org.apache.dubbo.rpc.protocol.tri.rest.argument.TypeConverter;
 import org.apache.dubbo.rpc.protocol.tri.rest.mapping.condition.MethodsCondition;
 import org.apache.dubbo.rpc.protocol.tri.rest.mapping.meta.HandlerMeta;
 import org.apache.dubbo.rpc.protocol.tri.rest.util.RequestUtils;
@@ -51,13 +53,15 @@ public final class RestRequestHandlerMapping implements RequestHandlerMapping {
 
     private final RequestMappingRegistry requestMappingRegistry;
     private final ArgumentResolver argumentResolver;
+    private final TypeConverter typeConverter;
     private final ContentNegotiator contentNegotiator;
     private final CodecUtils codecUtils;
 
     public RestRequestHandlerMapping(FrameworkModel frameworkModel) {
         ScopeBeanFactory beanFactory = frameworkModel.getBeanFactory();
         requestMappingRegistry = beanFactory.getOrRegisterBean(DefaultRequestMappingRegistry.class);
         argumentResolver = beanFactory.getOrRegisterBean(CompositeArgumentResolver.class);
+        typeConverter = beanFactory.getOrRegisterBean(GeneralTypeConverter.class);
         contentNegotiator = beanFactory.getOrRegisterBean(ContentNegotiator.class);
         codecUtils = beanFactory.getOrRegisterBean(CodecUtils.class);
     }
@@ -98,6 +102,7 @@ public RequestHandler getRequestHandler(URL url, HttpRequest request, HttpRespon
                 response,
                 meta.getParameters(),
                 argumentResolver,
+                typeConverter,
                 codecUtils.determineHttpMessageEncoder(url, responseMediaType));
 
         if (HttpMethods.supportBody(method) && !RequestUtils.isFormOrMultiPart(request)) {

dubbo-rpc/dubbo-rpc-triple/src/main/java/org/apache/dubbo/rpc/protocol/tri/rest/support/basic/ParamArgumentResolver.java

@@ -151,7 +151,7 @@ protected Object resolveMapValue(NamedValueMeta meta, HttpRequest request, HttpR
             case Param:
                 return RequestUtils.getParametersMap(request);
             case Header:
-                return request.headers();
+                return request.headers().asMap();
             case Cookie:
                 Collection<HttpCookie> cookies = request.cookies();
                 if (cookies.isEmpty()) {