Remove unnecessary conversion #139

- Remove unnecessary type conversion. - Found via: `golangci-lint run --enable unconvert ./...`

uh nice, can you enforce it by adding a .golangci.yml ?

uh nice, can you enforce it by adding a `.golangci.yml` ?

@6543 Added it, also added gocritic while I was at it.

 @ -46,3 +45,1 @@
 	header := make(http.Header)
 	var statusCode int
 func (f FileResponse) createHttpResponse(cacheKey string) (header http.Header, statusCode int) {

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