By chance, i found out that sometimes Go returned a Content-Type header
of text/plain for some responses to HTMx request. Go’s documentation
for http.ResponseWriter.Write sheds some light to this issue:
> If the Header does not contain a Content-Type line, Write adds a
> Content-Type set to the result of passing the initial 512 bytes of
> written data to DetectContentType.
http.DetectContentType has “sniff signatures” for the most common HTML
elements, such as `<BODY`, `<P`, or even `<!--`, but when the template
only has elements not in that list, the text “text sniff signature”
kicks in because the content does not contain binary data bytes, as
specified in [0], §7.1, step 9.
I can not change mustRenderTemplate’s wr parameter, and its callers’,
to be of type http.ResponseWriter because mustWriteInvoicePdf writes
the template to a pipe object, which is not of this type. Thus, i have
to resort to type assertion inside the method.
[0]: https://mimesniff.spec.whatwg.org/#identifying-a-resource-with-an-unknown-mime-type
jordi fita mas
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