slice+if_range problem

[cjhust@…]

server {
    listen 8888;

    location / {
        root html;
    }
}


server {
    listen 8000;

    location / {
        slice 128K;
        proxy_set_header range $slice_range;
        proxy_pass http://127.0.0.1:8888/;
    }
}


server {
    listen 8001;

    location / {
        proxy_pass http://127.0.0.1:8888/;
    }
}

#curl http://127.0.0.1:8001/4K.mp4 -o /dev/null -v -H 'range: bytes=1-2' -H 'if-range: Wed, 09 Aug 2017 08:29:34 GMT'
* About to connect() to 127.0.0.1 port 8001 (#0)
*   Trying 127.0.0.1...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0* Connected to 127.0.0.1 (127.0.0.1) port 8001 (#0)
> GET /4K.mp4 HTTP/1.1
> User-Agent: curl/7.29.0
> Host: 127.0.0.1:8001
> Accept: */*
> range: bytes=1-2
> if-range: Wed, 09 Aug 2017 08:29:34 GMT
> 
< HTTP/1.1 206 Partial Content
< Server: nginx/1.11.2
< Date: Tue, 15 Aug 2017 03:54:28 GMT
< Content-Type: video/mp4
< Content-Length: 2
< Connection: keep-alive
< Last-Modified: Wed, 09 Aug 2017 08:29:34 GMT
< ETag: "598ac7ee-1000"
< Content-Range: bytes 1-2/4096
< 
{ [data not shown]
100     2  100     2    0     0   1010      0 --:--:-- --:--:-- --:--:--  2000
* Connection #0 to host 127.0.0.1 left intact

return 206, meet expectation

#curl http://127.0.0.1:8000/4K.mp4 -o /dev/null -v -H 'range: bytes=1-2' -H 'if-range: Wed, 09 Aug 2017 08:29:34 GMT' 
* About to connect() to 127.0.0.1 port 8000 (#0)
*   Trying 127.0.0.1...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0* Connected to 127.0.0.1 (127.0.0.1) port 8000 (#0)
> GET /4K.mp4 HTTP/1.1
> User-Agent: curl/7.29.0
> Host: 127.0.0.1:8000
> Accept: */*
> range: bytes=1-2
> if-range: Wed, 09 Aug 2017 08:29:34 GMT
> 
< HTTP/1.1 200 OK
< Server: nginx/1.11.2
< Date: Tue, 15 Aug 2017 03:54:46 GMT
< Content-Type: video/mp4
< Content-Length: 4096
< Connection: keep-alive
< Last-Modified: Wed, 09 Aug 2017 08:29:34 GMT
< ETag: "598ac7ee-1000"
< Accept-Ranges: bytes
< 
{ [data not shown]
100  4096  100  4096    0     0  1036k      0 --:--:-- --:--:-- --:--:-- 1333k
* Connection #0 to host 127.0.0.1 left intact

return 200, not meet expectation

Is there some reason for slice module?
for user viewport, slice and no slice method must not change the HTTP result.

[cjhust@…]

The If-Range HTTP request header makes a range request conditional: if the condition is fulfilled, the range request will be issued and the server sends back a 206 Partial Content answer with the appropriate body. If the condition is not fulfilled, the full resource is sent back, with a 200 OK status.

[Maxim Dounin]

Please try the following patch:

# HG changeset patch
# User Maxim Dounin <mdounin@mdounin.ru>
# Date 1502813238 -10800
#      Tue Aug 15 19:07:18 2017 +0300
# Node ID d51ee844db963d4c51ea1d9eed335af19c95f43a
# Parent  a2f5e25d6a283546f76435b9fc3e7e814b092bae
Upstream: unconditional parsing of last_modified_time.

This fixes at least the following cases, where no last_modified_time
(assuming caching is not enabled) resulted in incorrect behaviour:

- slice filter and If-Range requests (ticket #1357);
- If-Range requests with proxy_force_ranges;
- expires modified.

diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -4390,15 +4390,8 @@ ngx_http_upstream_process_last_modified(
     u = r->upstream;
 
     u->headers_in.last_modified = h;
-
-#if (NGX_HTTP_CACHE)
-
-    if (u->cacheable) {
-        u->headers_in.last_modified_time = ngx_parse_http_time(h->value.data,
-                                                               h->value.len);
-    }
-
-#endif
+    u->headers_in.last_modified_time = ngx_parse_http_time(h->value.data,
+                                                           h->value.len);
 
     return NGX_OK;
 }
@@ -4940,15 +4933,8 @@ ngx_http_upstream_copy_last_modified(ngx
     *ho = *h;
 
     r->headers_out.last_modified = ho;
-
-#if (NGX_HTTP_CACHE)
-
-    if (r->upstream->cacheable) {
-        r->headers_out.last_modified_time =
+    r->headers_out.last_modified_time =
                                     r->upstream->headers_in.last_modified_time;
-    }
-
-#endif
 
     return NGX_OK;
 }