Implement redirect handler option. #622
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Signed-off-by: Ely Spears <espears@squarespace.com>
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Signed-off-by: Ely Spears <espears@squarespace.com>
Signed-off-by: Ely Spears <espears@squarespace.com>
Signed-off-by: Ely Spears <espears@squarespace.com>
Signed-off-by: Ely Spears <espears@squarespace.com>
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This fixes #131 and a significant amount of content is discussed in that issue.
This PR adds a new redirect handler utility class that deliberately forwards an unmodified request to the
Locationheader provided by a redirect, while preserving the method, headers and data of the original request. As discussed in comments of the PR, HTTP RFC 2616 requires explicit user approval for redirects in certain situations that may alter the meaning or effect of the request. Given this, the defaultHTTPRedirectHandlerinurllibdoes not honor redirects forPUTand does not preserve all headers and data.In the case of Prometheus, many users will have some type of in-house "private" deployment of a Prometheus pushgateway server, and e.g. in a deployment infrastructure like Kubernetes where the ultimate IP-based host address could change often, there may be a need for a purely cosmetic redirect that fronts this host address with an easier static URL. In that case, the user would like to "opt in" to trusted pass-through redirects for all method types (including PUT).
This PR provides
passthrough_redirect_handlerto support this specific redirect option. Use of this special redirect handler would constitute the user's explicit approval for RFC2616.Additionally, this PR adds a new "redirect" HTTPD server to the unit tests for the pushgateway, in order to simulate a real redirect during testing and confirm it is handled as expected. I've locally validated all testing and flake8 instructions - and will work to resolve any requested changes or build issues.