for _, tt := range badMediaTypeTests {
		mt, params, err := ParseMediaType(tt.in)
		if err == nil {
			t.Errorf("ParseMediaType(%q) = nil error; want parse error", tt.in)
			continue
		}
		if err.Error() != tt.err {
			t.Errorf("ParseMediaType(%q) = err %q; want %q", tt.in, err.Error(), tt.err)
		}
		if params != nil {
			t.Errorf("ParseMediaType(%q): got non-nil params on error", tt.in)
		}

		mimeTypesLower.Store(k, v)
	}
	for k, v := range mixExt {
		mimeTypes.Store(k, v)
	}

	extensionsMu.Lock()
	defer extensionsMu.Unlock()
	for k, v := range lowerExt {
		justType, _, err := ParseMediaType(v)
		if err != nil {
			panic(err)
		}
		var exts []string
		if ei, ok := extensions.Load(justType); ok {
			exts = ei.([]string)
		}
		extensions.Store(justType, append(exts, k))
	}
}

	}
	return nil
}

// ErrInvalidMediaParameter is returned by [ParseMediaType] if
// the media type value was found but there was an error parsing
// the optional parameters
var ErrInvalidMediaParameter = errors.New("mime: invalid media parameter")

// ParseMediaType parses a media type value and any optional
// parameters, per RFC 1521.  Media types are the values in

// storage and memory versions.
func NewStorageCodec(opts StorageCodecConfig) (runtime.Codec, runtime.GroupVersioner, error) {
	mediaType, _, err := mime.ParseMediaType(opts.StorageMediaType)
	if err != nil {
		return nil, nil, fmt.Errorf("%q is not a valid mime-type", opts.StorageMediaType)
	}

	supportedMediaTypes := opts.StorageSerializer.SupportedMediaTypes()

		} else if tt.ok {
			got := w.Boundary()
			if got != tt.b {
				t.Errorf("boundary = %q; want %q", got, tt.b)
			}

			ct := w.FormDataContentType()
			mt, params, err := mime.ParseMediaType(ct)
			if err != nil {
				t.Errorf("could not parse Content-Type %q: %v", ct, err)
			} else if mt != "multipart/form-data" {
				t.Errorf("unexpected media type %q; want %q", mt, "multipart/form-data")

	types, streamTypes           []string
}

func (n *fakeNegotiater) SupportedMediaTypes() []runtime.SerializerInfo {
	var out []runtime.SerializerInfo
	for _, s := range n.types {
		mediaType, _, err := mime.ParseMediaType(s)
		if err != nil {
			panic(err)
		}
		parts := strings.SplitN(mediaType, "/", 2)
		if len(parts) == 1 {
			// this is an error on the server side
			parts = append(parts, "")
		}

	var err error
	p.disposition, p.dispositionParams, err = mime.ParseMediaType(v)
	if err != nil {
		p.dispositionParams = emptyParams
	}
}

// NewReader creates a new multipart [Reader] reading from r using the
// given MIME boundary.
//
// The boundary is usually obtained from the "boundary" parameter of
// the message's "Content-Type" header. Use [mime.ParseMediaType] to
// parse such headers.

		Header:     map[string][]string(res.Header),
		Body:       res.Body,
	}

	if res.StatusCode != http.StatusOK {
		contentType := res.Header.Get("Content-Type")
		if mediaType, params, _ := mime.ParseMediaType(contentType); mediaType == "text/plain" {
			switch charset := strings.ToLower(params["charset"]); charset {
			case "us-ascii", "utf-8", "":
				// Body claims to be plain text in UTF-8 or a subset thereof.

				EncodesAsText:    d.EncodesAsText,
				Serializer:       d.Serializer,
				PrettySerializer: d.PrettySerializer,
				StrictSerializer: d.StrictSerializer,
			}

			mediaType, _, err := mime.ParseMediaType(info.MediaType)
			if err != nil {
				panic(err)
			}
			parts := strings.SplitN(mediaType, "/", 2)
			info.MediaTypeType = parts[0]
			info.MediaTypeSubType = parts[1]

	_, ok := r.Form[xhttp.AmzAccessKeyID]
	return ok
}

// Verify if request has AWS Post policy Signature Version '4'.
func isRequestPostPolicySignatureV4(r *http.Request) bool {
	mediaType, _, err := mime.ParseMediaType(r.Header.Get(xhttp.ContentType))
	if err != nil {
		return false
	}
	return mediaType == "multipart/form-data" && r.Method == http.MethodPost
}