From 6e1db348178d5df35d8d9bc37f924804b777a83c Mon Sep 17 00:00:00 2001
From: Brian Warner <warner@allmydata.com>
Date: Tue, 28 Oct 2008 18:01:03 -0700
Subject: [PATCH] web/filenode: add Accept-Ranges and ETag (for immutable
 files) headers to GET responses

---
 src/allmydata/web/filenode.py | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/allmydata/web/filenode.py b/src/allmydata/web/filenode.py
index b96ba175..472f782c 100644
--- a/src/allmydata/web/filenode.py
+++ b/src/allmydata/web/filenode.py
@@ -10,7 +10,7 @@ from allmydata.interfaces import ExistingChildError
 from allmydata.monitor import Monitor
 from allmydata.immutable.upload import FileHandle
 from allmydata.immutable.filenode import LiteralFileNode
-from allmydata.util import log
+from allmydata.util import log, base32
 
 from allmydata.web.common import text_plain, WebError, IClient, RenderMixin, \
      boolean_of_arg, get_arg, should_create_intermediate_directories
@@ -353,6 +353,13 @@ class FileDownloader(rend.Page):
         assert isinstance(filesize, (int,long)), filesize
         offset, size = 0, None
         contentsize = filesize
+        req.setHeader("accept-ranges", "bytes")
+        if not self.filenode.is_mutable():
+            # TODO: look more closely at Request.setETag and how it interacts
+            # with a conditional "if-etag-equals" request, I think this may
+            # need to occur after the setResponseCode below
+            req.setETag(base32.b2a(self.filenode.get_storage_index()))
+            # TODO: for mutable files, use the roothash
         rangeheader = req.getHeader('range')
         if rangeheader:
             # adapted from nevow.static.File
-- 
2.45.2