🚀 Log request headers in logger middleware

[mckingho]

Is your feature request related to a problem?
Yes. I want to log whole request headers using logger middleware.

Describe the solution you'd like
A new template tag could be added and support the feature logging all request headers.

const (
    TagReqHeaders = "reqHeaders"
)

Additional context
According to #1148, I can only get all headers using fasthttp's functions. Maybe it is also good to add a function for fiber context.

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[shytikov]

I think that makes sense if the default logging format would be JSON, not plain text as it is right now. Frankly, I don't know how to implement that in a readable manner in plain text, or how to enforce the JSON in the current implementation...

Am I wrong about that?

[mckingho]

I think there is no standard for logging format, but I prefer single-line json string for request logging.
Here is a snippet in my workaround:

headers := make(map[string]string)
c.Request().Header.VisitAll(func(k, v []byte) {
	headers[string(k)] = string(v)
})
headersBuffer, _ := json.Marshal(headers)
_ = c.Locals("headers", headersBuffer)

[etloreq]

What about the Authorization header and maybe some other secret data? There should be a way to specify secret headers that should not be logged

[c1moore]

Is this still applicable? Looks like there's already a TagReqHeaders tag.