This StackOverflow answer cites the RFC which defines headers.
Each header field consists of a name followed by a colon (":") and the field value. Field names are case-insensitive.
This means that if I send an HTTP request with the header
"accept: text/html" (note the lowercase
A), it will be translated to
In practical terms, this means in my Go code I must do
Headers["Accept"], where the
Headers map is an attribute on a
Strangely, AWS API Gateway seems to do it the other way around, where “normal” headers such as
Accept are lowercased into
I discovered this while trying to use the header in a Lambda function.