bug: redirect plugin redirects all the time when https

[ACanOfGas]

Issue description

redirect plugin redirects all the time when https

Environment

• apisix version (cmd: apisix version): 1.4
• OS:centos8

Minimal test code / Steps to reproduce the issue

1.api config redirects plugins
2.Triggers an http access and redirect to https
3.Subsequent https accesses are still being redirected

What's the actual result? (including assertion message & call stack if applicable)

Subsequent https accesses are still being redirected

What's the expected result?

https normal access

rediretc plugin modify conf.uri and conf.ret_code, result in Subsequent access conf.uri and conf.ret_code always not nil

[membphis]

please show us the how did you set the redirect plugin, we need to confirm.

[ACanOfGas]

{
"redirect":{
"http_to_https":true,
"ret_code" : 302
}
}

[ACanOfGas]

please show us the how did you set the redirect plugin, we need to confirm.

{
"redirect":{
"http_to_https":true,
"ret_code" : 302
}
}

[membphis]

What is the way to enable this feature?

[membphis]

this should be a bug, will fix it as soon as possible.

[membphis]

@ACanOfGas please make a try with the master branch, we have fixed this issue.