[FFmpeg-cvslog] Document why we always send a Range HTTP header.

[Reimar Döffinger]

ffmpeg | branch: master | Reimar Döffinger <Reimar.Doeffinger at gmx.de> | Sun Sep 23 15:26:56 2012 +0200| [033f53fb8f4c095e8d465e90325bc4521c4ddca6] | committer: Reimar Döffinger

Document why we always send a Range HTTP header.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger at gmx.de>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=033f53fb8f4c095e8d465e90325bc4521c4ddca6
---

 libavformat/http.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavformat/http.c b/libavformat/http.c
index 85ed7a5..ede4e8b 100644
--- a/libavformat/http.c
+++ b/libavformat/http.c
@@ -411,6 +411,9 @@ static int http_connect(URLContext *h, const char *path, const char *local_path,
     if (!has_header(s->headers, "\r\nAccept: "))
         len += av_strlcpy(headers + len, "Accept: */*\r\n",
                           sizeof(headers) - len);
+    // Note: we send this on purpose even when s->off is 0,
+    // since it allows us to detect more reliably if a (non-conforming)
+    // server supports seeking by analysing the reply headers.
     if (!has_header(s->headers, "\r\nRange: ") && !post)
         len += av_strlcatf(headers + len, sizeof(headers) - len,
                            "Range: bytes=%"PRId64"-\r\n", s->off);