When trying to make more than one HTTPS request to the same host via `url-retrieve-synchronously' behind my work proxy, only the first request succeeds. Depending on the host, subsequent requests result in 400/404/302 and perhaps a couple other response codes. There's some minimal code below that can be run with emacs -Q, but I don't know how to replicate the proxy.
It seems that commit 84613dae5c3 is at least partially responsible for this. It's a small change to `url-https-proxy-after-change-function' that binds `url-http-proxy' around the call to `url-http-create-request'. Without that binding, I see no errors. I tested this both in 26.2.90 which does not include that commit, and the revision in this report by simply redefining the function to the older version.
This happens both when `url-proxy-services' is set manually and when it is set from environment variables.
I'm not sure if this is a problem with Emacs, the proxy I'm behind, or if there is some configuration I should be aware of that already addresses this. Please let me know if there's any other useful information I can provide.
Sample code and the corresponding url-http buffer headers follow. The specific URLs don't seem to matter as long they are HTTPS. The optional arguments also don't seem to make a difference.
- David
Code:
First request (success):
HTTP/1.1 200 OK
Server: nginx
Content-Type: text/html; charset=UTF-8
Last-Modified: Thu, 15 Aug 2019 11:24:39 GMT
Expires: Thu, 15 Aug 2019 21:22:11 GMT
Cache-Control: max-age=300
Content-Length: 3012
Accept-Ranges: bytes
Date: Fri, 16 Aug 2019 01:32:01 GMT
Via: 1.1 varnish
Age: 142
Connection: keep-alive
X-Served-By: cache-mdw17348-MDW
X-Cache: HIT
X-Cache-Hits: 1
X-Timer: S1565919121.298692,VS0,VE0
Vary: Accept-Encoding
Second request (failuer):
HTTP/1.1 400 Bad Request
Server: nginx
Content-Type: text/html; charset=UTF-8
Content-Length: 166
Accept-Ranges: bytes
Date: Fri, 16 Aug 2019 01:32:01 GMT
Via: 1.1 varnish
Connection: keep-alive
X-Served-By: cache-mdw17348-MDW
X-Cache: MISS
X-Cache-Hits: 0
X-Timer: S1565919121.349321,VS0,VE26
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