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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [MirageOS-devel] Web server MIME types / content types
Hi Andrew,
It looks like Cohttp will respond with content-type, but only when
using Cohttp_lwt_unix.respond_file [1]. That's a convenience function
for serving a file from the local filesystem, which assumes too much
for a unikernel environment (hence it is in the _unix module).
Assuming you are using something like mirage-skeleton/static_website,
you can add the content-type bits to your dispatch function [2].
After read_fs returns the content data, feed the vpath to magic-mime
to guess the type and add your own content-type header -- maybe:
try_lwt
read_fs path
>>= fun body ->
let mime_type = Magic_mime.lookup path in
let headers = Cohttp.Header.init in
let headers = Cohttp.Header.add_opt headers "content-type" mime_type in
S.respond_string ~status:`OK ~body ~headers ()
To include magic-mime in your kernel, you will need to reference it
with add_to_ocamlfind_libraries / add_to_opam_packages in config.ml.
This would be a nice feature to have in a higher-level project like
mirage-seal [3].
[1]
https://github.com/mirage/ocaml-cohttp/blob/84450beb6a532be8455a30c7782dbf1b3294622e/lwt/cohttp_lwt_unix.ml#L55
[2]
https://github.com/mirage/mirage-skeleton/blob/a13cde3bb0421f3685c16b1ae5ef334986c6d0f0/static_website/dispatch.ml#L39
[3] https://github.com/mirage/mirage-seal/
--
Len
On Fri, May 29, 2015 at 6:49 AM, Andrew Stuart
<andrew.stuart@xxxxxxxxxxxxxxxxxx> wrote:
>>> Which version of which web server are you using?
>
> ubuntu@ip-172-30-2-123:~/www.supercoders.com.au$ opam list | grep http
> cohttp 0.17.2 HTTP library for Lwt, Async and Mirage
> mirage-http 2.2.0 Mirage HTTP client and server driver
> ubuntu@ip-172-30-2-123:~/www.supercoders.com.au$
>
>>> What are you serving and what media type is being set?
>
> Just plain HTML pages and images.
>
>>> What configuration are you using?
>
> Err, not sure. How can I say? Itâs a unikernel built with the latest
> release as far as I can tell.
>
> Interestingly the release notes here
> https://github.com/mirage/ocaml-cohttp/blob/master/CHANGES
>
> says:
>
> 0.16.0 (2015-03-23):
> New features and bug fixes:
> * Use the `magic-mime` library to add a MIME type by probing filename
> during static serving in the Lwt/Async backends. (#260)
>
> But it does not appear to be doing so.
>
>
> Below are two requests, one to nginx and one Mirageos. You can see that
> Mirageos is not returning Content-Type: text/html
>
> **************************************************
> *********************************************NGINX:
> ubuntu@xxxxxxxxxxxxxxxxxxxxxx:/var/www/supercoders.com.au/htdocs$ curl -v -D
> - http://www.supercoders.com.au
> * Rebuilt URL to: http://www.supercoders.com.au/
> * Hostname was NOT found in DNS cache
> * Trying 54.215.13.78...
> * Connected to www.supercoders.com.au (54.215.13.78) port 80 (#0)
>> GET / HTTP/1.1
>> User-Agent: curl/7.35.0
>> Host: www.supercoders.com.au
>> Accept: */*
>>
> < HTTP/1.1 200 OK
> HTTP/1.1 200 OK
> * Server nginx/1.4.6 (Ubuntu) is not blacklisted
> < Server: nginx/1.4.6 (Ubuntu)
> Server: nginx/1.4.6 (Ubuntu)
> < Date: Fri, 29 May 2015 10:47:52 GMT
> Date: Fri, 29 May 2015 10:47:52 GMT
> < Content-Type: text/html
> Content-Type: text/html
> < Transfer-Encoding: chunked
> Transfer-Encoding: chunked
> < Connection: keep-alive
> Connection: keep-alive
>
> <
> <html >
> <head>
>
>
> **************************************************
> *********************************************MirageOS:
> ubuntu@xxxxxxxxxxxxxxxxxxxxxx:/var/www/supercoders.com.au/htdocs$ curl -v -D
> - http://54.177.71.245
> * Rebuilt URL to: http://54.177.71.245/
> * Hostname was NOT found in DNS cache
> * Trying 54.177.71.245...
> * Connected to 54.177.71.245 (54.177.71.245) port 80 (#0)
>> GET / HTTP/1.1
>> User-Agent: curl/7.35.0
>> Host: 54.177.71.245
>> Accept: */*
>>
> < HTTP/1.1 200 OK
> HTTP/1.1 200 OK
> < content-length: 21281
> content-length: 21281
>
> <
> <html >
> <head>
>
>
>
>
>
> _______________________________________________
> MirageOS-devel mailing list
> MirageOS-devel@xxxxxxxxxxxxxxxxxxxx
> http://lists.xenproject.org/cgi-bin/mailman/listinfo/mirageos-devel
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