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Re: Retrieve the correct header for 'Accept-Encoding:' used by the compressed remote resource.

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From: Hongyi Zhao via curl-users <curl-users_at_cool.haxx.se>
Date: Thu, 28 Jan 2021 14:53:04 +0800

On Thu, Jan 28, 2021 at 1:05 PM Ray Satiro via curl-users
<curl-users_at_cool.haxx.se> wrote:
>
> On 1/27/2021 9:13 PM, Hongyi Zhao via curl-users wrote:
> > See my following testings about interacting with compressed remote
> > resources using curl:
> >
> > werner_at_X10DAi:~$ curl --compressed -I --etag-save 111
> > https://www.thepolyglotdeveloper.com/css/custom.min.css
> > HTTP/2 200
> > accept-ranges: bytes
> > cache-control: public, max-age=0, must-revalidate
> > content-type: text/css; charset=UTF-8
> > date: Wed, 27 Jan 2021 15:05:06 GMT
> > etag: "95b8df8e4f25366b91b9ed4850c8269e-ssl-df"
> > strict-transport-security: max-age=31536000
> > content-encoding: br
> > age: 39361
> > content-length: 1450
> > server: Netlify
> > vary: Accept-Encoding
> > x-nf-request-id: 663ffd26-7b69-4c59-b0bb-50e6de8c7fa1-3429084
> >
> > werner_at_X10DAi:~$ cat 111
> > 95b8df8e4f25366b91b9ed4850c8269e-ssl-df
> >
> > werner_at_X10DAi:~$ curl -I --etag-compare 111
> > https://www.thepolyglotdeveloper.com/css/custom.min.css
> > HTTP/2 200
> > accept-ranges: bytes
> > cache-control: public, max-age=0, must-revalidate
> > content-length: 6285
> > content-type: text/css; charset=UTF-8
> > date: Thu, 28 Jan 2021 01:59:35 GMT
> > etag: "95b8df8e4f25366b91b9ed4850c8269e-ssl"
> > strict-transport-security: max-age=31536000
> > age: 122
> > server: Netlify
> > x-nf-request-id: c731d3d2-19ee-4b03-91ec-b96e8d06464c-8953234
> >
> > werner_at_X10DAi:~$ curl -I --etag-compare 111 -H 'Accept-Encoding: gzip,
> > deflate, br'https://www.thepolyglotdeveloper.com/css/custom.min.css
> > HTTP/2 304
> > date: Thu, 28 Jan 2021 02:02:00 GMT
> > etag: "95b8df8e4f25366b91b9ed4850c8269e-ssl-df"
> > cache-control: public, max-age=0, must-revalidate
> > server: Netlify
> > vary: Accept-Encoding
> > x-nf-request-id: ae8bba17-c715-4a61-8e00-0a85d77334e2-5196200
> >
> >
> > As you can see, I must supply appropriate 'Accept-Encoding:' string to
> > the server combined with the saved etag for obtaining the correct
> > response from the server, i.e., the 304 code for denoting that the
> > remote resource hasn't been changed/updated since I've retrieved the
> > etag last time.
> >
> > But I still can't figure out how to obtain the correct sting value for
> > the 'Accept-Encoding:' used by the header for passing to the remote
> > server. Any hints will be highly appreciated.
>
>
> Accept-Encoding should not be manually set. Use --compressed which sets
> it to the encodings supported by your build of curl.

How to list the supported options in the building time?

Regards

-- 
Assoc. Prof. Hongyi Zhao <hongyi.zhao_at_gmail.com>
Theory and Simulation of Materials
Hebei Polytechnic University of Science and Technology engineering
NO. 552 North Gangtie Road, Xingtai, China
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Received on 2021-01-28

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