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Add cache-control headers to hopefully disable caching on streaming responses; untested so far

This commit is contained in:
Tony Garnock-Jones 2012-04-30 23:58:15 -04:00
parent 0f8efaf4cf
commit 66a6182a40
3 changed files with 39 additions and 2 deletions
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6
httpd.ml
View File

@ -56,6 +56,12 @@ let content_type_header_name = "Content-Type"
let html_content_type_header = (content_type_header_name, html_content_type)
let text_content_type_header = (content_type_header_name, text_content_type)
let disable_cache_headers () =
["Expires", "Thu, 01 Jan 1981 00:00:00 GMT";
"Last-Modified", Httpd_date.http_gmtime (Unix.time ());
"Cache-Control", "no-cache, must-revalidate, max-age=0";
"Pragma", "no-cache"]
let add_completion_callback resp cb =
{resp with completion_callbacks = cb :: resp.completion_callbacks}

29
httpd_date.ml Normal file
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@ -0,0 +1,29 @@
(* Copyright 2012 Tony Garnock-Jones <tonygarnockjones@gmail.com>. *)
(* This file is part of Ocamlmsg. *)
(* Ocamlmsg is free software: you can redistribute it and/or modify it *)
(* under the terms of the GNU General Public License as published by the *)
(* Free Software Foundation, either version 3 of the License, or (at your *)
(* option) any later version. *)
(* Ocamlmsg is distributed in the hope that it will be useful, but *)
(* WITHOUT ANY WARRANTY; without even the implied warranty of *)
(* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *)
(* General Public License for more details. *)
(* You should have received a copy of the GNU General Public License *)
(* along with Ocamlmsg. If not, see <http://www.gnu.org/licenses/>. *)
open Unix
let days = ["Sun"; "Mon"; "Tue"; "Wed"; "Thu"; "Fri"; "Sat"]
let months = ["Jan"; "Feb"; "Mar"; "Apr"; "May"; "Jun"; "Jul"; "Aug"; "Sep"; "Oct"; "Nov"; "Dec"]
(* Example: *)
(* Wed, 15 Nov 1995 06:25:24 GMT *)
let http_gmtime t =
let tm = gmtime t in
Printf.sprintf "%s, %02d %s %04d %02d:%02d:%02d GMT"
(List.nth days tm.tm_wday) tm.tm_mday (List.nth months tm.tm_mon) (tm.tm_year + 1900)
tm.tm_hour tm.tm_min tm.tm_sec

6
ui_relay.ml
View File

@ -46,8 +46,10 @@ let rec api_tap_source id r =
Sexp.Str "", Sexp.Str ""));
Httpd.add_completion_callback
(Httpd.resp_generic 200 "Streaming"
[Httpd.text_content_type_header;
"Access-Control-Allow-Origin", "*"]
([Httpd.text_content_type_header;
"Access-Control-Allow-Origin", "*";
"Date", Httpd_date.http_gmtime (Unix.time ())]
@ Httpd.disable_cache_headers ())
(Httpd.Variable
(Stringstream.switch_after 131072
(Stringstream.seq id_block_and_padding (Stringstream.make (message_stream ch)))