diff --git a/feat-core/src/main/java/tech/smartboot/feat/core/client/impl/AbstractOutputStream.java b/feat-core/src/main/java/tech/smartboot/feat/core/client/impl/AbstractOutputStream.java
index e9b05ec79eb6eb15b37cf3d133b9f0e800ea9971..ca533e132cf61d83c826734a87a0b1ad788f5106 100644
--- a/feat-core/src/main/java/tech/smartboot/feat/core/client/impl/AbstractOutputStream.java
+++ b/feat-core/src/main/java/tech/smartboot/feat/core/client/impl/AbstractOutputStream.java
@@ -55,6 +55,7 @@ abstract class AbstractOutputStream extends FeatOutputStream {
         if (request.getContentType() != null) {
             writeString(HeaderName.CONTENT_TYPE.getName());
             writeBuffer.writeByte((byte) ':');
+            writeBuffer.writeByte((byte) ' ');
             writeBuffer.write(getBytes(String.valueOf(request.getContentType())));
             writeBuffer.write(FeatUtils.CRLF_BYTES);
         }
@@ -62,6 +63,7 @@ abstract class AbstractOutputStream extends FeatOutputStream {
         if (request.getContentLength() >= 0) {
             writeString(HeaderName.CONTENT_LENGTH.getName());
             writeBuffer.writeByte((byte) ':');
+            writeBuffer.writeByte((byte) ' ');
             writeBuffer.write(getBytes(String.valueOf(request.getContentLength())));
             writeBuffer.write(FeatUtils.CRLF_BYTES);
         } else if (chunkedSupport) {
@@ -75,6 +77,7 @@ abstract class AbstractOutputStream extends FeatOutputStream {
                 while (headerValue != null) {
                     writeString(entry.getKey());
                     writeBuffer.writeByte((byte) ':');
+                    writeBuffer.writeByte((byte) ' ');
                     writeString(headerValue.getValue());
                     writeBuffer.write(FeatUtils.CRLF_BYTES);
                     headerValue = headerValue.getNextValue();
diff --git a/feat-core/src/main/java/tech/smartboot/feat/core/common/io/FeatOutputStream.java b/feat-core/src/main/java/tech/smartboot/feat/core/common/io/FeatOutputStream.java
index 3d86912ac400e0335f0400069348c55ef65166e9..9fb877ba0e1f40fa9f55e1339850a518eb9b8493 100644
--- a/feat-core/src/main/java/tech/smartboot/feat/core/common/io/FeatOutputStream.java
+++ b/feat-core/src/main/java/tech/smartboot/feat/core/common/io/FeatOutputStream.java
@@ -149,7 +149,7 @@ public abstract class FeatOutputStream extends OutputStream implements Reset {
                 writeBuffer.write("0\r\n".getBytes());
                 Map<String, String> map = trailerSupplier.get();
                 for (String key : map.keySet()) {
-                    writeBuffer.write((key + ":" + map.get(key) + "\r\n").getBytes());
+                    writeBuffer.write((key + ": " + map.get(key) + "\r\n").getBytes());
                 }
                 writeBuffer.write(FeatUtils.CRLF_BYTES);
             } else {
diff --git a/feat-core/src/main/java/tech/smartboot/feat/core/server/impl/HttpOutputStream.java b/feat-core/src/main/java/tech/smartboot/feat/core/server/impl/HttpOutputStream.java
index 999a1e32d845ef02ce7e6b0e67ba2d192d9ac0f6..bd02af5c9ae3051be64a5858126b5e6c2de63848 100644
--- a/feat-core/src/main/java/tech/smartboot/feat/core/server/impl/HttpOutputStream.java
+++ b/feat-core/src/main/java/tech/smartboot/feat/core/server/impl/HttpOutputStream.java
@@ -29,7 +29,9 @@ import java.util.concurrent.TimeUnit;
  * @version v1.0.0
  */
 final class HttpOutputStream extends FeatOutputStream {
-    private static final String TEXT_PLAIN_FAST_WRITE = HttpProtocol.HTTP_11.getProtocol() + " 200 OK\r\n" + HeaderName.SERVER.getName() + ":feat/" + Feat.VERSION + "\r\nDate:" + FeatUtils.formatRFC1123(FeatUtils.currentTime()) + "\r\nContent-Type:" + HeaderValue.ContentType.TEXT_PLAIN_UTF8 + "\r\nContent-Length:";
+    private static final String TEXT_PLAIN_FAST_WRITE = HttpProtocol.HTTP_11.getProtocol() + " 200 OK\r\n" + HeaderName.SERVER.getName() + ": feat/" + Feat.VERSION + "\r\nDate: " + FeatUtils.formatRFC1123(FeatUtils.currentTime()) + "\r\nContent-Type: " + HeaderValue.ContentType.TEXT_PLAIN_UTF8 + "\r\nContent-Length: ";
+    // 以下索引/长度全部从 TEXT_PLAIN_FAST_WRITE 的文本中推导，改动上面常量里的
+    // 头名前缀（例如冒号后补空格）时必须同步核对。
     private static final int SERVER_INDEX = TEXT_PLAIN_FAST_WRITE.indexOf(HeaderName.SERVER.getName());
     private static final int DATE_INDEX = TEXT_PLAIN_FAST_WRITE.indexOf("Date:");
     private static final int SERVER_INDEX_LENGTH = TEXT_PLAIN_FAST_WRITE.indexOf(HeaderName.DATE.getName()) - SERVER_INDEX;
@@ -37,7 +39,7 @@ final class HttpOutputStream extends FeatOutputStream {
     private static final int PLAIN_CONTENT_LENGTH_INDEX = TEXT_PLAIN_FAST_WRITE.indexOf(HeaderName.CONTENT_LENGTH.getName()) - 2;
     private static final byte[] TEXT_PLAIN_FAST_WRITE_BYTES = TEXT_PLAIN_FAST_WRITE.getBytes();
 
-    private static final String APPLICATION_JSON = HttpProtocol.HTTP_11.getProtocol() + " 200 OK\r\n" + HeaderName.SERVER.getName() + ":feat/" + Feat.VERSION + "\r\nDate:" + FeatUtils.formatRFC1123(FeatUtils.currentTime()) + "\r\nContent-Type:" + HeaderValue.ContentType.APPLICATION_JSON + "\r\nContent-Length:";
+    private static final String APPLICATION_JSON = HttpProtocol.HTTP_11.getProtocol() + " 200 OK\r\n" + HeaderName.SERVER.getName() + ": feat/" + Feat.VERSION + "\r\nDate: " + FeatUtils.formatRFC1123(FeatUtils.currentTime()) + "\r\nContent-Type: " + HeaderValue.ContentType.APPLICATION_JSON + "\r\nContent-Length: ";
     private static final int JSON_CONTENT_LENGTH_INDEX = APPLICATION_JSON.indexOf(HeaderName.CONTENT_LENGTH.getName()) - 2;
     private static final byte[] APPLICATION_JSON_FAST_WRITE_BYTES = APPLICATION_JSON.getBytes();
     private static final byte[] CHUNKED = "\r\nTransfer-Encoding: chunked\r\n\r\n".getBytes();
@@ -48,8 +50,8 @@ final class HttpOutputStream extends FeatOutputStream {
 
         HashedWheelTimer.DEFAULT_TIMER.scheduleWithFixedDelay(() -> {
             byte[] bytes = FeatUtils.formatRFC1123(FeatUtils.currentTime()).getBytes();
-            System.arraycopy(bytes, 0, TEXT_PLAIN_FAST_WRITE_BYTES, DATE_INDEX + 5, bytes.length);
-            System.arraycopy(bytes, 0, APPLICATION_JSON_FAST_WRITE_BYTES, DATE_INDEX + 5, bytes.length);
+            System.arraycopy(bytes, 0, TEXT_PLAIN_FAST_WRITE_BYTES, DATE_INDEX + 6, bytes.length);
+            System.arraycopy(bytes, 0, APPLICATION_JSON_FAST_WRITE_BYTES, DATE_INDEX + 6, bytes.length);
         }, 800, TimeUnit.MILLISECONDS);
     }
 
@@ -96,6 +98,7 @@ final class HttpOutputStream extends FeatOutputStream {
             while (headerValue != null) {
                 writeString(entry.getKey());
                 writeBuffer.writeByte((byte) ':');
+                writeBuffer.writeByte((byte) ' ');
                 writeString(headerValue.getValue());
                 writeBuffer.write(FeatUtils.CRLF_BYTES);
                 headerValue = headerValue.getNextValue();
@@ -129,15 +132,15 @@ final class HttpOutputStream extends FeatOutputStream {
             writeBuffer.write(TEXT_PLAIN_FAST_WRITE_BYTES, SERVER_INDEX, SERVER_INDEX_LENGTH);
         }
         // Date
-        writeBuffer.write(TEXT_PLAIN_FAST_WRITE_BYTES, DATE_INDEX, 34);
+        writeBuffer.write(TEXT_PLAIN_FAST_WRITE_BYTES, DATE_INDEX, 35);
 
         if (contentType != null) {
-            writeBuffer.write(TEXT_PLAIN_FAST_WRITE_BYTES, PLAIN_CONTENT_TYPE_INDEX, 15);
+            writeBuffer.write(TEXT_PLAIN_FAST_WRITE_BYTES, PLAIN_CONTENT_TYPE_INDEX, 16);
             writeString(contentType);
         }
 
         if (contentLength >= 0) {
-            writeBuffer.write(TEXT_PLAIN_FAST_WRITE_BYTES, PLAIN_CONTENT_LENGTH_INDEX, 17);
+            writeBuffer.write(TEXT_PLAIN_FAST_WRITE_BYTES, PLAIN_CONTENT_LENGTH_INDEX, 18);
             writeLongString(contentLength);
             if (hasHeader) {
                 writeBuffer.write(FeatUtils.CRLF_BYTES);