diff --git a/internal/caches/partial_ranges.go b/internal/caches/partial_ranges.go
index 5fa9a21..dad4841 100644
--- a/internal/caches/partial_ranges.go
+++ b/internal/caches/partial_ranges.go
@@ -188,6 +188,11 @@ func (this *PartialRanges) Reset() {
 	this.Ranges = [][2]int64{}
 }
 
+// IsCompleted 是否已下载完整
+func (this *PartialRanges) IsCompleted() bool {
+	return len(this.Ranges) == 1 && this.Ranges[0][0] == 0 && this.Ranges[0][1] == this.BodySize-1
+}
+
 func (this *PartialRanges) merge(index int) {
 	// forward
 	var lastIndex = index
diff --git a/internal/caches/reader_partial_file.go b/internal/caches/reader_partial_file.go
index fa47895..d45c0cb 100644
--- a/internal/caches/reader_partial_file.go
+++ b/internal/caches/reader_partial_file.go
@@ -34,7 +34,7 @@ func (this *PartialFileReader) InitAutoDiscard(autoDiscard bool) error {
 		this.header = this.openFile.header
 	}
 
-	isOk := false
+	var isOk = false
 
 	if autoDiscard {
 		defer func() {
@@ -54,9 +54,9 @@ func (this *PartialFileReader) InitAutoDiscard(autoDiscard bool) error {
 	var buf = this.meta
 	if len(buf) == 0 {
 		buf = make([]byte, SizeMeta)
-		ok, err := this.readToBuff(this.fp, buf)
-		if err != nil {
-			return err
+		ok, readErr := this.readToBuff(this.fp, buf)
+		if readErr != nil {
+			return readErr
 		}
 		if !ok {
 			return ErrNotFound
@@ -73,10 +73,10 @@ func (this *PartialFileReader) InitAutoDiscard(autoDiscard bool) error {
 	this.status = status
 
 	// URL
-	urlLength := binary.BigEndian.Uint32(buf[SizeExpiresAt+SizeStatus : SizeExpiresAt+SizeStatus+SizeURLLength])
+	var urlLength = binary.BigEndian.Uint32(buf[SizeExpiresAt+SizeStatus : SizeExpiresAt+SizeStatus+SizeURLLength])
 
 	// header
-	headerSize := int(binary.BigEndian.Uint32(buf[SizeExpiresAt+SizeStatus+SizeURLLength : SizeExpiresAt+SizeStatus+SizeURLLength+SizeHeaderLength]))
+	var headerSize = int(binary.BigEndian.Uint32(buf[SizeExpiresAt+SizeStatus+SizeURLLength : SizeExpiresAt+SizeStatus+SizeURLLength+SizeHeaderLength]))
 	if headerSize == 0 {
 		return nil
 	}
@@ -96,7 +96,7 @@ func (this *PartialFileReader) InitAutoDiscard(autoDiscard bool) error {
 	if this.openFileCache != nil && len(this.header) == 0 {
 		if headerSize > 0 && headerSize <= 512 {
 			this.header = make([]byte, headerSize)
-			_, err := this.fp.Seek(this.headerOffset, io.SeekStart)
+			_, err = this.fp.Seek(this.headerOffset, io.SeekStart)
 			if err != nil {
 				return err
 			}
@@ -140,6 +140,10 @@ func (this *PartialFileReader) Ranges() *PartialRanges {
 	return this.ranges
 }
 
+func (this *PartialFileReader) IsCompleted() bool {
+	return this.ranges != nil && this.ranges.IsCompleted()
+}
+
 func (this *PartialFileReader) discard() error {
 	_ = os.Remove(this.rangePath)
 	return this.FileReader.discard()
diff --git a/internal/nodes/http_request_cache.go b/internal/nodes/http_request_cache.go
index d37e611..45f6db6 100644
--- a/internal/nodes/http_request_cache.go
+++ b/internal/nodes/http_request_cache.go
@@ -279,7 +279,7 @@ func (this *HTTPRequest) doCacheRead(useStale bool) (shouldStop bool) {
 			}
 
 			if len(rangeHeader) > 0 {
-				pReader, ranges := this.tryPartialReader(storage, key, useStale, rangeHeader)
+				pReader, ranges := this.tryPartialReader(storage, key, useStale, rangeHeader, this.cacheRef.ForcePartialContent)
 				if pReader != nil {
 					isPartialCache = true
 					reader = pReader
@@ -650,7 +650,7 @@ func (this *HTTPRequest) addExpiresHeader(expiresAt int64) {
 }
 
 // 尝试读取区间缓存
-func (this *HTTPRequest) tryPartialReader(storage caches.StorageInterface, key string, useStale bool, rangeHeader string) (caches.Reader, []rangeutils.Range) {
+func (this *HTTPRequest) tryPartialReader(storage caches.StorageInterface, key string, useStale bool, rangeHeader string, forcePartialContent bool) (caches.Reader, []rangeutils.Range) {
 	// 尝试读取Partial cache
 	if len(rangeHeader) == 0 {
 		return nil, nil
@@ -678,15 +678,18 @@ func (this *HTTPRequest) tryPartialReader(storage caches.StorageInterface, key s
 		}
 	}()
 
+	// 检查是否已下载完整
+	if !forcePartialContent &&
+		len(ranges) > 0 &&
+		ranges[0][0] == 0 &&
+		ranges[0][1] < 0 &&
+		!partialReader.IsCompleted() {
+		return nil, nil
+	}
+
 	// 检查范围
-	//const maxFirstSpan = 16 << 20 // TODO 可以在缓存策略中设置此值
+	// 这里 **切记不要** 为末尾位置指定一个中间值，因为部分软件客户端不支持
 	for index, r := range ranges {
-		// 没有指定结束位置时，自动指定一个
-		/**if r.Start() >= 0 && r.End() == -1 {
-			if partialReader.MaxLength() > r.Start()+maxFirstSpan {
-				r[1] = r.Start() + maxFirstSpan
-			}
-		}**/
 		r1, ok := r.Convert(partialReader.MaxLength())
 		if !ok {
 			return nil, nil