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Update "Accept" header parsing for list values

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In Go's header parsing, the same header multiple times results in multiple entries in the `r.Header[...]` slice, but Go does no further parsing beyond that (and in https://golang.org/cl/4528086 it was determined that until/unless the stdlib itself needs it, Go will not do so).

The consequence here for parsing of `Accept:` headers is that we support the way Go outputs headers, but not all language HTTP libraries have a facility to output multiple headers instead of a single list header.

This change ensures that the following (valid) header blocks all parse to the same result for the purposes of what is being tested here:

```
Accept: a/b
Accept: b/c
Accept: d/e
```

```
Accept: a/b; q=0.5, b/c
Accept: d/e
```

```
Accept: a/b; q=0.1, b/c; q=0.2, d/e; q=0.8
```

Signed-off-by: Andrew "Tianon" Page <admwiggin@gmail.com>
This commit is contained in:
Tianon Gravi 2016-06-10 16:34:08 -07:00
parent 4746b30e31
commit 5de53e3448
2 changed files with 20 additions and 4 deletions
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4
docs/handlers/api_test.go
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@ -1586,8 +1586,8 @@ func testManifestAPIManifestList(t *testing.T, env *testEnv, args manifestArgs)
if err != nil {
t.Fatalf("Error constructing request: %s", err)
}
req.Header.Set("Accept", manifestlist.MediaTypeManifestList)
req.Header.Add("Accept", schema1.MediaTypeSignedManifest)
// multiple headers in mixed list format to ensure we parse correctly server-side
req.Header.Set("Accept", fmt.Sprintf(` %s ; q=0.8 , %s ; q=0.5 `, manifestlist.MediaTypeManifestList, schema1.MediaTypeSignedManifest))
req.Header.Add("Accept", schema2.MediaTypeManifest)
resp, err = http.DefaultClient.Do(req)
if err != nil {