common

func IsWeakETag ¶

func IsWeakETag(etag string) bool

IsWeakETag reports whether the ETag is a weak validator (W/"...") which must not be used with If-Range per RFC 7232 §2.1.

func ParseContentRange ¶

func ParseContentRange(h string) (int64, int64, int64, bool)

ParseContentRange parses "Content-Range: bytes start-end/total". It returns (start, end, total, ok). When total is unknown, total == -1.

func ParseSingleRange ¶

func ParseSingleRange(h string) (int64, int64, bool)

ParseSingleRange parses a single "Range: bytes=start-end" header. It returns (start, end, ok). When end is omitted, end == -1.

Notes:

• Only absolute-start forms are supported (no suffix ranges "-N").
• Multi-range specifications (comma separated) return ok == false.

func ScrubConditionalHeaders ¶

func ScrubConditionalHeaders(h http.Header)

ScrubConditionalHeaders removes conditional headers we do not want to forward on range requests, because they can alter semantics or conflict with If-Range logic.

func SupportsRange ¶

func SupportsRange(h http.Header) bool

SupportsRange determines whether an HTTP response indicates support for range requests.