* Expire in 0 ms for 6 (transfer 0x560b469bd950)
.......
* Expire in 0 ms for 1 (transfer 0x560b469bd950)
*   Trying 151.101.1.69...
* TCP_NODELAY set
* Expire in 74999 ms for 3 (transfer 0x560b469bd950)
* Expire in 200 ms for 4 (transfer 0x560b469bd950)
* Connected to stackoverflow.com (151.101.1.69) port 443 (#0)
* ALPN, offering http/1.1
* successfully set certificate verify locations:
*   CAfile: none
  CApath: /etc/ssl/certs
* SSL connection using TLSv1.2 / ECDHE-RSA-AES128-GCM-SHA256
* ALPN, server accepted to use http/1.1
* Server certificate:
*  subject: CN=*.stackexchange.com
*  start date: Mar  3 14:52:01 2020 GMT
*  expire date: Jun  1 14:52:01 2020 GMT
*  subjectAltName: host "stackoverflow.com" matched cert's "stackoverflow.com"
*  issuer: C=US; O=Let's Encrypt; CN=Let's Encrypt Authority X3
*  SSL certificate verify ok.
> GET / HTTP/1.1

Host: stackoverflow.com

User-Agent: GuzzleHttp/6.3.3 curl/7.64.0 PHP/7.3.15



!!!!!!!!!!!!!!!!!!!!!!!!!!!!

< HTTP/1.1 200 OK

< Cache-Control: private

< Content-Type: text/html; charset=utf-8

< X-Frame-Options: SAMEORIGIN

< X-Request-Guid: b94940d1-119e-4013-83d0-c2fb770a1a3c

< Strict-Transport-Security: max-age=15552000

< Feature-Policy: microphone 'none'; speaker 'none'

< Content-Security-Policy: upgrade-insecure-requests; frame-ancestors 'self' https://stackexchange.com

< Content-Length: 112370

< Accept-Ranges: bytes

< Date: Mon, 09 Mar 2020 15:24:18 GMT

< Via: 1.1 varnish

< Connection: keep-alive

< X-Served-By: cache-hhn4031-HHN

< X-Cache: MISS

< X-Cache-Hits: 0

< X-Timer: S1583767459.656808,VS0,VE91

< Vary: Fastly-SSL

< X-DNS-Prefetch-Control: off

< Set-Cookie: prov=b680faa5-0423-cff9-7e0d-8868a0f78e5a; domain=.stackoverflow.com; expires=Fri, 01-Jan-2055 00:00:00 GMT; path=/; HttpOnly

<

* Connection #0 to host stackoverflow.com left intact



!!!!!!!!!!!!!!!!!!!!!!!!!!!!
THE SECOND REQUEST STARTS FROM HERE



* Expire in 0 ms for 6 (transfer 0x560b469e3e50)
........
* Expire in 0 ms for 1 (transfer 0x560b469e3e50)
*   Trying 151.101.1.69...
* TCP_NODELAY set
* Expire in 74999 ms for 3 (transfer 0x560b469e3e50)
* Expire in 200 ms for 4 (transfer 0x560b469e3e50)
* Connected to stackoverflow.com (151.101.1.69) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* successfully set certificate verify locations:
*   CAfile: none
  CApath: /etc/ssl/certs
* SSL connection using TLSv1.2 / ECDHE-RSA-AES128-GCM-SHA256
* ALPN, server accepted to use h2
* Server certificate:
*  subject: CN=*.stackexchange.com
*  start date: Mar  3 14:52:01 2020 GMT
*  expire date: Jun  1 14:52:01 2020 GMT
*  subjectAltName: host "stackoverflow.com" matched cert's "stackoverflow.com"
*  issuer: C=US; O=Let's Encrypt; CN=Let's Encrypt Authority X3
*  SSL certificate verify ok.
* Using HTTP2, server supports multi-use
* Connection state changed (HTTP/2 confirmed)
* Copying HTTP/2 data in stream buffer to connection buffer after upgrade: len=0
* Using Stream ID: 1 (easy handle 0x560b469e3e50)
> GET / HTTP/2

Host: stackoverflow.com

User-Agent: GuzzleHttp/6.3.3 curl/7.64.0 PHP/7.3.15



* Connection state changed (MAX_CONCURRENT_STREAMS == 100)!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!

< HTTP/2 200

< cache-control: private

< content-type: text/html; charset=utf-8

< x-frame-options: SAMEORIGIN

< x-request-guid: b5c6ed39-8e80-45f3-a834-22a8e5fb220a

< strict-transport-security: max-age=15552000

< feature-policy: microphone 'none'; speaker 'none'

< content-security-policy: upgrade-insecure-requests; frame-ancestors 'self' https://stackexchange.com

< accept-ranges: bytes

< date: Mon, 09 Mar 2020 15:24:19 GMT

< via: 1.1 varnish

< x-served-by: cache-hhn4043-HHN

< x-cache: MISS

< x-cache-hits: 0

< x-timer: S1583767459.029016,VS0,VE90

< vary: Fastly-SSL

< x-dns-prefetch-control: off

< set-cookie: prov=6184c6a3-2598-a014-a27a-3b13f10c9c09; domain=.stackoverflow.com; expires=Fri, 01-Jan-2055 00:00:00 GMT; path=/; HttpOnly

< content-length: 112370

<

* Connection #0 to host stackoverflow.com left intact