我的Rails应用程序利用了会话，或者换句话说，利用了控制器响应在cookie标头中设置的会话ID。
除了通过Capybara启动应用程序，然后出于某些原因，响应标头从不包含Set-Cookie之外，此方法均正常运行。
该请求是否来自启动硒的浏览器都没有关系。我可以卷曲到Capybara启动的Puma服务器，也永远不会获得cookie设置。
我看了一下Capybara Puma服务器启动的中间件，它似乎包含了会话和cookie组件，就像普通的一样。我在网上找不到关于此的任何内容，而且似乎永远不会有在Rails 5.2中进行系统测试的会话是一个很大的问题。所以我想我以某种方式做错了事，但不知道可能是什么。
以下是正常请求示例：
Host: localhost:3000
Connection: keep-alive
Upgrade-Insecure-Requests: 1
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/11.1.2 Safari/605.1.15
Accept-Language: en-us
DNT: 1
Accept-Encoding: gzip, deflate
HTTP/1.1 200 OK
X-Frame-Options: ALLOWALL
X-XSS-Protection: 1; mode=block
X-Content-Type-Options: nosniff
X-Download-Options: noopen
X-Permitted-Cross-Domain-Policies: none
Referrer-Policy: strict-origin-when-cross-origin
Content-Type: text/html; charset=utf-8
ETag: W/"bb9f6e144809fdf8359cec8ca0cbfc09"
Cache-Control: max-age=0, private, must-revalidate
Set-Cookie: _rails_app_session=......................; path=/; HttpOnly
X-Meta-Request-Version: 0.6.0
X-Request-Id: a2f2591b-7523-4c32-98a0-1d1fdc0fd231
X-Runtime: 0.867249
Vary: Origin
Transfer-Encoding: chunked
请注意Set-Cookie: _rails_app_session=......................;存在。
这是点击水豚服务器的示例：
GET /calculator HTTP/1.1
Host: localhost:3030
Connection: keep-alive
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8
Accept-Encoding: gzip, deflate, br
Accept-Language: en-US,en;q=0.9
HTTP/1.1 200 OK
X-Frame-Options: ALLOWALL
X-XSS-Protection: 1; mode=block
X-Content-Type-Options: nosniff
X-Download-Options: noopen
X-Permitted-Cross-Domain-Policies: none
Referrer-Policy: strict-origin-when-cross-origin
Content-Type: text/html; charset=utf-8
ETag: W/"040559a7884c3251acd2082604a43cf3"
Cache-Control: max-age=0, private, must-revalidate
X-Request-Id: 2bc191c6-66e9-4fe6-a8d2-7980f6cc66ed
X-Runtime: 0.146430
Vary: Origin
Transfer-Encoding: chunked