The http_response plugin does not maintain headers when following redirects.

[zrice57]

Bug report

After following redirects, the http_response plugin uses the default user-agent of
"Go-http-client/1.1".

Relevant telegraf.conf:

I'm including the erb used to generate my config.
[[inputs.http_response]]
address = "url"
response_timeout = "10s"
method = "GET"
follow_redirects = true
interval = "30s"

[inputs.http_response.headers]
User-Agent = "ServiceUptime"

System info:

[Include Telegraf version, operating system name, and other relevant details]
Centos 7.3
Telegraf v1.2.1 (git: release-1.2 3b6ffb3)

Proposal:

Use the defined headers during redirect requests.

Use case: [Why is this important (helps with prioritizing requests)]

It makes it difficult to properly filter the requests from analytics data.

[danielnelson]

I believe this was fixed by changes in go 1.8, which we are planning to use to build telegraf 1.3.

• net/http: copy headers when following redirects golang/go#4800
• https://beta.golang.org/doc/go1.8#net_http