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Clean up config.Header to http.Header conversion #426

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Clean up config.Header to http.Header conversion #426

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17 changes: 10 additions & 7 deletions config/config.go
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Original file line number Diff line number Diff line change
Expand Up @@ -59,14 +59,17 @@ func (h *Header) HTTPHeader() http.Header {
header := make(http.Header)

for name, values := range *h {
var s []string
if values != nil {
s = make([]string, 0, len(values))
for _, value := range values {
s = append(s, string(value))
}
// HTTP allows for empty headers. The best representation of a
// header with a nil or empty set of values is a single empty
// string.
if len(values) == 0 {
header.Set(name, "")
continue
}

for _, value := range values {
header.Add(name, string(value))
}
header[name] = s
}

return header
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11 changes: 7 additions & 4 deletions config/config_test.go
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Expand Up @@ -70,10 +70,13 @@ func TestHeaderHTTPHeader(t *testing.T) {
"nil": nil,
},
expected: http.Header{
"single": []string{"v1"},
"multi": []string{"v1", "v2"},
"empty": []string{},
"nil": nil,
// note that the conversion from config.header
// to http.Header will use the canonical form
// of the header names.
"Single": []string{"v1"},
"Multi": []string{"v1", "v2"},
"Empty": []string{""},
"Nil": []string{""},
},
},
"nil": {
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