fix: compatible with not follow the http range response standard

internal/protocol/http/fetcher.go

@@ -18,6 +18,7 @@ import (
 	"os"
 	"path"
 	"strconv"
+	"strings"
 	"time"
 )
 
@@ -104,8 +105,8 @@ func (f *Fetcher) Resolve(req *base.Request) error {
 		Range: false,
 		Files: []*base.FileInfo{},
 	}
-	if base.HttpCodePartialContent == httpResp.StatusCode {
-		// 返回206响应码表示支持断点下载
+	if base.HttpCodePartialContent == httpResp.StatusCode || (base.HttpCodeOK == httpResp.StatusCode && httpResp.Header.Get(base.HttpHeaderAcceptRanges) == base.HttpHeaderBytes && strings.HasPrefix(httpResp.Header.Get(base.HttpHeaderContentRange), base.HttpHeaderBytes)) {
+		// 1.返回206响应码表示支持断点下载 2.不返回206但是Accept-Ranges首部并且等于bytes也表示支持断点下载
 		res.Range = true
 		// 解析资源大小: bytes 0-1000/1001 => 1001
 		contentTotal := path.Base(httpResp.Header.Get(base.HttpHeaderContentRange))

pkg/base/constants.go

@@ -16,10 +16,12 @@ const (
 	HttpCodePartialContent = 206
 
 	HttpHeaderRange              = "Range"
+	HttpHeaderAcceptRanges       = "Accept-Ranges"
 	HttpHeaderContentLength      = "Content-Length"
 	HttpHeaderContentRange       = "Content-Range"
 	HttpHeaderContentDisposition = "Content-Disposition"
 	HttpHeaderUserAgent          = "Usr-Agent"
 
+	HttpHeaderBytes       = "bytes"
 	HttpHeaderRangeFormat = "bytes=%d-%d"
 )