diff --git a/vendor/go.opentelemetry.io/otel/baggage/baggage.go b/vendor/go.opentelemetry.io/otel/baggage/baggage.go
new file mode 100644
index 0000000..0e1fe24
--- /dev/null
+++ b/vendor/go.opentelemetry.io/otel/baggage/baggage.go
@@ -0,0 +1,1018 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package baggage // import "go.opentelemetry.io/otel/baggage"
+
+import (
+	"errors"
+	"fmt"
+	"net/url"
+	"strings"
+	"unicode/utf8"
+
+	"go.opentelemetry.io/otel/internal/baggage"
+)
+
+const (
+	maxMembers               = 180
+	maxBytesPerMembers       = 4096
+	maxBytesPerBaggageString = 8192
+
+	listDelimiter     = ","
+	keyValueDelimiter = "="
+	propertyDelimiter = ";"
+)
+
+var (
+	errInvalidKey      = errors.New("invalid key")
+	errInvalidValue    = errors.New("invalid value")
+	errInvalidProperty = errors.New("invalid baggage list-member property")
+	errInvalidMember   = errors.New("invalid baggage list-member")
+	errMemberNumber    = errors.New("too many list-members in baggage-string")
+	errMemberBytes     = errors.New("list-member too large")
+	errBaggageBytes    = errors.New("baggage-string too large")
+)
+
+// Property is an additional metadata entry for a baggage list-member.
+type Property struct {
+	key, value string
+
+	// hasValue indicates if a zero-value value means the property does not
+	// have a value or if it was the zero-value.
+	hasValue bool
+}
+
+// NewKeyProperty returns a new Property for key.
+//
+// The passed key must be valid, non-empty UTF-8 string.
+// If key is invalid, an error will be returned.
+// However, the specific Propagators that are used to transmit baggage entries across
+// component boundaries may impose their own restrictions on Property key.
+// For example, the W3C Baggage specification restricts the Property keys to strings that
+// satisfy the token definition from RFC7230, Section 3.2.6.
+// For maximum compatibility, alphanumeric value are strongly recommended to be used as Property key.
+func NewKeyProperty(key string) (Property, error) {
+	if !validateBaggageName(key) {
+		return newInvalidProperty(), fmt.Errorf("%w: %q", errInvalidKey, key)
+	}
+
+	p := Property{key: key}
+	return p, nil
+}
+
+// NewKeyValueProperty returns a new Property for key with value.
+//
+// The passed key must be compliant with W3C Baggage specification.
+// The passed value must be percent-encoded as defined in W3C Baggage specification.
+//
+// Notice: Consider using [NewKeyValuePropertyRaw] instead
+// that does not require percent-encoding of the value.
+func NewKeyValueProperty(key, value string) (Property, error) {
+	if !validateKey(key) {
+		return newInvalidProperty(), fmt.Errorf("%w: %q", errInvalidKey, key)
+	}
+
+	if !validateValue(value) {
+		return newInvalidProperty(), fmt.Errorf("%w: %q", errInvalidValue, value)
+	}
+	decodedValue, err := url.PathUnescape(value)
+	if err != nil {
+		return newInvalidProperty(), fmt.Errorf("%w: %q", errInvalidValue, value)
+	}
+	return NewKeyValuePropertyRaw(key, decodedValue)
+}
+
+// NewKeyValuePropertyRaw returns a new Property for key with value.
+//
+// The passed key must be valid, non-empty UTF-8 string.
+// The passed value must be valid UTF-8 string.
+// However, the specific Propagators that are used to transmit baggage entries across
+// component boundaries may impose their own restrictions on Property key.
+// For example, the W3C Baggage specification restricts the Property keys to strings that
+// satisfy the token definition from RFC7230, Section 3.2.6.
+// For maximum compatibility, alphanumeric value are strongly recommended to be used as Property key.
+func NewKeyValuePropertyRaw(key, value string) (Property, error) {
+	if !validateBaggageName(key) {
+		return newInvalidProperty(), fmt.Errorf("%w: %q", errInvalidKey, key)
+	}
+	if !validateBaggageValue(value) {
+		return newInvalidProperty(), fmt.Errorf("%w: %q", errInvalidValue, value)
+	}
+
+	p := Property{
+		key:      key,
+		value:    value,
+		hasValue: true,
+	}
+	return p, nil
+}
+
+func newInvalidProperty() Property {
+	return Property{}
+}
+
+// parseProperty attempts to decode a Property from the passed string. It
+// returns an error if the input is invalid according to the W3C Baggage
+// specification.
+func parseProperty(property string) (Property, error) {
+	if property == "" {
+		return newInvalidProperty(), nil
+	}
+
+	p, ok := parsePropertyInternal(property)
+	if !ok {
+		return newInvalidProperty(), fmt.Errorf("%w: %q", errInvalidProperty, property)
+	}
+
+	return p, nil
+}
+
+// validate ensures p conforms to the W3C Baggage specification, returning an
+// error otherwise.
+func (p Property) validate() error {
+	errFunc := func(err error) error {
+		return fmt.Errorf("invalid property: %w", err)
+	}
+
+	if !validateBaggageName(p.key) {
+		return errFunc(fmt.Errorf("%w: %q", errInvalidKey, p.key))
+	}
+	if !p.hasValue && p.value != "" {
+		return errFunc(errors.New("inconsistent value"))
+	}
+	if p.hasValue && !validateBaggageValue(p.value) {
+		return errFunc(fmt.Errorf("%w: %q", errInvalidValue, p.value))
+	}
+	return nil
+}
+
+// Key returns the Property key.
+func (p Property) Key() string {
+	return p.key
+}
+
+// Value returns the Property value. Additionally, a boolean value is returned
+// indicating if the returned value is the empty if the Property has a value
+// that is empty or if the value is not set.
+func (p Property) Value() (string, bool) {
+	return p.value, p.hasValue
+}
+
+// String encodes Property into a header string compliant with the W3C Baggage
+// specification.
+// It would return empty string if the key is invalid with the W3C Baggage
+// specification. This could happen for a UTF-8 key, as it may contain
+// invalid characters.
+func (p Property) String() string {
+	//  W3C Baggage specification does not allow percent-encoded keys.
+	if !validateKey(p.key) {
+		return ""
+	}
+
+	if p.hasValue {
+		return fmt.Sprintf("%s%s%v", p.key, keyValueDelimiter, valueEscape(p.value))
+	}
+	return p.key
+}
+
+type properties []Property
+
+func fromInternalProperties(iProps []baggage.Property) properties {
+	if len(iProps) == 0 {
+		return nil
+	}
+
+	props := make(properties, len(iProps))
+	for i, p := range iProps {
+		props[i] = Property{
+			key:      p.Key,
+			value:    p.Value,
+			hasValue: p.HasValue,
+		}
+	}
+	return props
+}
+
+func (p properties) asInternal() []baggage.Property {
+	if len(p) == 0 {
+		return nil
+	}
+
+	iProps := make([]baggage.Property, len(p))
+	for i, prop := range p {
+		iProps[i] = baggage.Property{
+			Key:      prop.key,
+			Value:    prop.value,
+			HasValue: prop.hasValue,
+		}
+	}
+	return iProps
+}
+
+func (p properties) Copy() properties {
+	if len(p) == 0 {
+		return nil
+	}
+
+	props := make(properties, len(p))
+	copy(props, p)
+	return props
+}
+
+// validate ensures each Property in p conforms to the W3C Baggage
+// specification, returning an error otherwise.
+func (p properties) validate() error {
+	for _, prop := range p {
+		if err := prop.validate(); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// String encodes properties into a header string compliant with the W3C Baggage
+// specification.
+func (p properties) String() string {
+	props := make([]string, 0, len(p))
+	for _, prop := range p {
+		s := prop.String()
+
+		// Ignored empty properties.
+		if s != "" {
+			props = append(props, s)
+		}
+	}
+	return strings.Join(props, propertyDelimiter)
+}
+
+// Member is a list-member of a baggage-string as defined by the W3C Baggage
+// specification.
+type Member struct {
+	key, value string
+	properties properties
+
+	// hasData indicates whether the created property contains data or not.
+	// Properties that do not contain data are invalid with no other check
+	// required.
+	hasData bool
+}
+
+// NewMember returns a new Member from the passed arguments.
+//
+// The passed key must be compliant with W3C Baggage specification.
+// The passed value must be percent-encoded as defined in W3C Baggage specification.
+//
+// Notice: Consider using [NewMemberRaw] instead
+// that does not require percent-encoding of the value.
+func NewMember(key, value string, props ...Property) (Member, error) {
+	if !validateKey(key) {
+		return newInvalidMember(), fmt.Errorf("%w: %q", errInvalidKey, key)
+	}
+
+	if !validateValue(value) {
+		return newInvalidMember(), fmt.Errorf("%w: %q", errInvalidValue, value)
+	}
+	decodedValue, err := url.PathUnescape(value)
+	if err != nil {
+		return newInvalidMember(), fmt.Errorf("%w: %q", errInvalidValue, value)
+	}
+	return NewMemberRaw(key, decodedValue, props...)
+}
+
+// NewMemberRaw returns a new Member from the passed arguments.
+//
+// The passed key must be valid, non-empty UTF-8 string.
+// The passed value must be valid UTF-8 string.
+// However, the specific Propagators that are used to transmit baggage entries across
+// component boundaries may impose their own restrictions on baggage key.
+// For example, the W3C Baggage specification restricts the baggage keys to strings that
+// satisfy the token definition from RFC7230, Section 3.2.6.
+// For maximum compatibility, alphanumeric value are strongly recommended to be used as baggage key.
+func NewMemberRaw(key, value string, props ...Property) (Member, error) {
+	m := Member{
+		key:        key,
+		value:      value,
+		properties: properties(props).Copy(),
+		hasData:    true,
+	}
+	if err := m.validate(); err != nil {
+		return newInvalidMember(), err
+	}
+	return m, nil
+}
+
+func newInvalidMember() Member {
+	return Member{}
+}
+
+// parseMember attempts to decode a Member from the passed string. It returns
+// an error if the input is invalid according to the W3C Baggage
+// specification.
+func parseMember(member string) (Member, error) {
+	if n := len(member); n > maxBytesPerMembers {
+		return newInvalidMember(), fmt.Errorf("%w: %d", errMemberBytes, n)
+	}
+
+	var props properties
+	keyValue, properties, found := strings.Cut(member, propertyDelimiter)
+	if found {
+		// Parse the member properties.
+		for _, pStr := range strings.Split(properties, propertyDelimiter) {
+			p, err := parseProperty(pStr)
+			if err != nil {
+				return newInvalidMember(), err
+			}
+			props = append(props, p)
+		}
+	}
+	// Parse the member key/value pair.
+
+	// Take into account a value can contain equal signs (=).
+	k, v, found := strings.Cut(keyValue, keyValueDelimiter)
+	if !found {
+		return newInvalidMember(), fmt.Errorf("%w: %q", errInvalidMember, member)
+	}
+	// "Leading and trailing whitespaces are allowed but MUST be trimmed
+	// when converting the header into a data structure."
+	key := strings.TrimSpace(k)
+	if !validateKey(key) {
+		return newInvalidMember(), fmt.Errorf("%w: %q", errInvalidKey, key)
+	}
+
+	rawVal := strings.TrimSpace(v)
+	if !validateValue(rawVal) {
+		return newInvalidMember(), fmt.Errorf("%w: %q", errInvalidValue, v)
+	}
+
+	// Decode a percent-encoded value.
+	unescapeVal, err := url.PathUnescape(rawVal)
+	if err != nil {
+		return newInvalidMember(), fmt.Errorf("%w: %w", errInvalidValue, err)
+	}
+
+	value := replaceInvalidUTF8Sequences(len(rawVal), unescapeVal)
+	return Member{key: key, value: value, properties: props, hasData: true}, nil
+}
+
+// replaceInvalidUTF8Sequences replaces invalid UTF-8 sequences with '�'.
+func replaceInvalidUTF8Sequences(c int, unescapeVal string) string {
+	if utf8.ValidString(unescapeVal) {
+		return unescapeVal
+	}
+	// W3C baggage spec:
+	// https://github.com/w3c/baggage/blob/8c215efbeebd3fa4b1aceb937a747e56444f22f3/baggage/HTTP_HEADER_FORMAT.md?plain=1#L69
+
+	var b strings.Builder
+	b.Grow(c)
+	for i := 0; i < len(unescapeVal); {
+		r, size := utf8.DecodeRuneInString(unescapeVal[i:])
+		if r == utf8.RuneError && size == 1 {
+			// Invalid UTF-8 sequence found, replace it with '�'
+			_, _ = b.WriteString("�")
+		} else {
+			_, _ = b.WriteRune(r)
+		}
+		i += size
+	}
+
+	return b.String()
+}
+
+// validate ensures m conforms to the W3C Baggage specification.
+// A key must be an ASCII string, returning an error otherwise.
+func (m Member) validate() error {
+	if !m.hasData {
+		return fmt.Errorf("%w: %q", errInvalidMember, m)
+	}
+
+	if !validateBaggageName(m.key) {
+		return fmt.Errorf("%w: %q", errInvalidKey, m.key)
+	}
+	if !validateBaggageValue(m.value) {
+		return fmt.Errorf("%w: %q", errInvalidValue, m.value)
+	}
+	return m.properties.validate()
+}
+
+// Key returns the Member key.
+func (m Member) Key() string { return m.key }
+
+// Value returns the Member value.
+func (m Member) Value() string { return m.value }
+
+// Properties returns a copy of the Member properties.
+func (m Member) Properties() []Property { return m.properties.Copy() }
+
+// String encodes Member into a header string compliant with the W3C Baggage
+// specification.
+// It would return empty string if the key is invalid with the W3C Baggage
+// specification. This could happen for a UTF-8 key, as it may contain
+// invalid characters.
+func (m Member) String() string {
+	//  W3C Baggage specification does not allow percent-encoded keys.
+	if !validateKey(m.key) {
+		return ""
+	}
+
+	s := m.key + keyValueDelimiter + valueEscape(m.value)
+	if len(m.properties) > 0 {
+		s += propertyDelimiter + m.properties.String()
+	}
+	return s
+}
+
+// Baggage is a list of baggage members representing the baggage-string as
+// defined by the W3C Baggage specification.
+type Baggage struct { //nolint:golint
+	list baggage.List
+}
+
+// New returns a new valid Baggage. It returns an error if it results in a
+// Baggage exceeding limits set in that specification.
+//
+// It expects all the provided members to have already been validated.
+func New(members ...Member) (Baggage, error) {
+	if len(members) == 0 {
+		return Baggage{}, nil
+	}
+
+	b := make(baggage.List)
+	for _, m := range members {
+		if !m.hasData {
+			return Baggage{}, errInvalidMember
+		}
+
+		// OpenTelemetry resolves duplicates by last-one-wins.
+		b[m.key] = baggage.Item{
+			Value:      m.value,
+			Properties: m.properties.asInternal(),
+		}
+	}
+
+	// Check member numbers after deduplication.
+	if len(b) > maxMembers {
+		return Baggage{}, errMemberNumber
+	}
+
+	bag := Baggage{b}
+	if n := len(bag.String()); n > maxBytesPerBaggageString {
+		return Baggage{}, fmt.Errorf("%w: %d", errBaggageBytes, n)
+	}
+
+	return bag, nil
+}
+
+// Parse attempts to decode a baggage-string from the passed string. It
+// returns an error if the input is invalid according to the W3C Baggage
+// specification.
+//
+// If there are duplicate list-members contained in baggage, the last one
+// defined (reading left-to-right) will be the only one kept. This diverges
+// from the W3C Baggage specification which allows duplicate list-members, but
+// conforms to the OpenTelemetry Baggage specification.
+func Parse(bStr string) (Baggage, error) {
+	if bStr == "" {
+		return Baggage{}, nil
+	}
+
+	if n := len(bStr); n > maxBytesPerBaggageString {
+		return Baggage{}, fmt.Errorf("%w: %d", errBaggageBytes, n)
+	}
+
+	b := make(baggage.List)
+	for _, memberStr := range strings.Split(bStr, listDelimiter) {
+		m, err := parseMember(memberStr)
+		if err != nil {
+			return Baggage{}, err
+		}
+		// OpenTelemetry resolves duplicates by last-one-wins.
+		b[m.key] = baggage.Item{
+			Value:      m.value,
+			Properties: m.properties.asInternal(),
+		}
+	}
+
+	// OpenTelemetry does not allow for duplicate list-members, but the W3C
+	// specification does. Now that we have deduplicated, ensure the baggage
+	// does not exceed list-member limits.
+	if len(b) > maxMembers {
+		return Baggage{}, errMemberNumber
+	}
+
+	return Baggage{b}, nil
+}
+
+// Member returns the baggage list-member identified by key.
+//
+// If there is no list-member matching the passed key the returned Member will
+// be a zero-value Member.
+// The returned member is not validated, as we assume the validation happened
+// when it was added to the Baggage.
+func (b Baggage) Member(key string) Member {
+	v, ok := b.list[key]
+	if !ok {
+		// We do not need to worry about distinguishing between the situation
+		// where a zero-valued Member is included in the Baggage because a
+		// zero-valued Member is invalid according to the W3C Baggage
+		// specification (it has an empty key).
+		return newInvalidMember()
+	}
+
+	return Member{
+		key:        key,
+		value:      v.Value,
+		properties: fromInternalProperties(v.Properties),
+		hasData:    true,
+	}
+}
+
+// Members returns all the baggage list-members.
+// The order of the returned list-members is not significant.
+//
+// The returned members are not validated, as we assume the validation happened
+// when they were added to the Baggage.
+func (b Baggage) Members() []Member {
+	if len(b.list) == 0 {
+		return nil
+	}
+
+	members := make([]Member, 0, len(b.list))
+	for k, v := range b.list {
+		members = append(members, Member{
+			key:        k,
+			value:      v.Value,
+			properties: fromInternalProperties(v.Properties),
+			hasData:    true,
+		})
+	}
+	return members
+}
+
+// SetMember returns a copy of the Baggage with the member included. If the
+// baggage contains a Member with the same key, the existing Member is
+// replaced.
+//
+// If member is invalid according to the W3C Baggage specification, an error
+// is returned with the original Baggage.
+func (b Baggage) SetMember(member Member) (Baggage, error) {
+	if !member.hasData {
+		return b, errInvalidMember
+	}
+
+	n := len(b.list)
+	if _, ok := b.list[member.key]; !ok {
+		n++
+	}
+	list := make(baggage.List, n)
+
+	for k, v := range b.list {
+		// Do not copy if we are just going to overwrite.
+		if k == member.key {
+			continue
+		}
+		list[k] = v
+	}
+
+	list[member.key] = baggage.Item{
+		Value:      member.value,
+		Properties: member.properties.asInternal(),
+	}
+
+	return Baggage{list: list}, nil
+}
+
+// DeleteMember returns a copy of the Baggage with the list-member identified
+// by key removed.
+func (b Baggage) DeleteMember(key string) Baggage {
+	n := len(b.list)
+	if _, ok := b.list[key]; ok {
+		n--
+	}
+	list := make(baggage.List, n)
+
+	for k, v := range b.list {
+		if k == key {
+			continue
+		}
+		list[k] = v
+	}
+
+	return Baggage{list: list}
+}
+
+// Len returns the number of list-members in the Baggage.
+func (b Baggage) Len() int {
+	return len(b.list)
+}
+
+// String encodes Baggage into a header string compliant with the W3C Baggage
+// specification.
+// It would ignore members where the member key is invalid with the W3C Baggage
+// specification. This could happen for a UTF-8 key, as it may contain
+// invalid characters.
+func (b Baggage) String() string {
+	members := make([]string, 0, len(b.list))
+	for k, v := range b.list {
+		s := Member{
+			key:        k,
+			value:      v.Value,
+			properties: fromInternalProperties(v.Properties),
+		}.String()
+
+		// Ignored empty members.
+		if s != "" {
+			members = append(members, s)
+		}
+	}
+	return strings.Join(members, listDelimiter)
+}
+
+// parsePropertyInternal attempts to decode a Property from the passed string.
+// It follows the spec at https://www.w3.org/TR/baggage/#definition.
+func parsePropertyInternal(s string) (p Property, ok bool) {
+	// For the entire function we will use "   key    =    value  " as an example.
+	// Attempting to parse the key.
+	// First skip spaces at the beginning "<   >key    =    value  " (they could be empty).
+	index := skipSpace(s, 0)
+
+	// Parse the key: "   <key>    =    value  ".
+	keyStart := index
+	keyEnd := index
+	for _, c := range s[keyStart:] {
+		if !validateKeyChar(c) {
+			break
+		}
+		keyEnd++
+	}
+
+	// If we couldn't find any valid key character,
+	// it means the key is either empty or invalid.
+	if keyStart == keyEnd {
+		return
+	}
+
+	// Skip spaces after the key: "   key<    >=    value  ".
+	index = skipSpace(s, keyEnd)
+
+	if index == len(s) {
+		// A key can have no value, like: "   key    ".
+		ok = true
+		p.key = s[keyStart:keyEnd]
+		return
+	}
+
+	// If we have not reached the end and we can't find the '=' delimiter,
+	// it means the property is invalid.
+	if s[index] != keyValueDelimiter[0] {
+		return
+	}
+
+	// Attempting to parse the value.
+	// Match: "   key    =<    >value  ".
+	index = skipSpace(s, index+1)
+
+	// Match the value string: "   key    =    <value>  ".
+	// A valid property can be: "   key    =".
+	// Therefore, we don't have to check if the value is empty.
+	valueStart := index
+	valueEnd := index
+	for _, c := range s[valueStart:] {
+		if !validateValueChar(c) {
+			break
+		}
+		valueEnd++
+	}
+
+	// Skip all trailing whitespaces: "   key    =    value<  >".
+	index = skipSpace(s, valueEnd)
+
+	// If after looking for the value and skipping whitespaces
+	// we have not reached the end, it means the property is
+	// invalid, something like: "   key    =    value  value1".
+	if index != len(s) {
+		return
+	}
+
+	// Decode a percent-encoded value.
+	rawVal := s[valueStart:valueEnd]
+	unescapeVal, err := url.PathUnescape(rawVal)
+	if err != nil {
+		return
+	}
+	value := replaceInvalidUTF8Sequences(len(rawVal), unescapeVal)
+
+	ok = true
+	p.key = s[keyStart:keyEnd]
+	p.hasValue = true
+
+	p.value = value
+	return
+}
+
+func skipSpace(s string, offset int) int {
+	i := offset
+	for ; i < len(s); i++ {
+		c := s[i]
+		if c != ' ' && c != '\t' {
+			break
+		}
+	}
+	return i
+}
+
+var safeKeyCharset = [utf8.RuneSelf]bool{
+	// 0x23 to 0x27
+	'#':  true,
+	'$':  true,
+	'%':  true,
+	'&':  true,
+	'\'': true,
+
+	// 0x30 to 0x39
+	'0': true,
+	'1': true,
+	'2': true,
+	'3': true,
+	'4': true,
+	'5': true,
+	'6': true,
+	'7': true,
+	'8': true,
+	'9': true,
+
+	// 0x41 to 0x5a
+	'A': true,
+	'B': true,
+	'C': true,
+	'D': true,
+	'E': true,
+	'F': true,
+	'G': true,
+	'H': true,
+	'I': true,
+	'J': true,
+	'K': true,
+	'L': true,
+	'M': true,
+	'N': true,
+	'O': true,
+	'P': true,
+	'Q': true,
+	'R': true,
+	'S': true,
+	'T': true,
+	'U': true,
+	'V': true,
+	'W': true,
+	'X': true,
+	'Y': true,
+	'Z': true,
+
+	// 0x5e to 0x7a
+	'^': true,
+	'_': true,
+	'`': true,
+	'a': true,
+	'b': true,
+	'c': true,
+	'd': true,
+	'e': true,
+	'f': true,
+	'g': true,
+	'h': true,
+	'i': true,
+	'j': true,
+	'k': true,
+	'l': true,
+	'm': true,
+	'n': true,
+	'o': true,
+	'p': true,
+	'q': true,
+	'r': true,
+	's': true,
+	't': true,
+	'u': true,
+	'v': true,
+	'w': true,
+	'x': true,
+	'y': true,
+	'z': true,
+
+	// remainder
+	'!': true,
+	'*': true,
+	'+': true,
+	'-': true,
+	'.': true,
+	'|': true,
+	'~': true,
+}
+
+// validateBaggageName checks if the string is a valid OpenTelemetry Baggage name.
+// Baggage name is a valid, non-empty UTF-8 string.
+func validateBaggageName(s string) bool {
+	if len(s) == 0 {
+		return false
+	}
+
+	return utf8.ValidString(s)
+}
+
+// validateBaggageValue checks if the string is a valid OpenTelemetry Baggage value.
+// Baggage value is a valid UTF-8 strings.
+// Empty string is also a valid UTF-8 string.
+func validateBaggageValue(s string) bool {
+	return utf8.ValidString(s)
+}
+
+// validateKey checks if the string is a valid W3C Baggage key.
+func validateKey(s string) bool {
+	if len(s) == 0 {
+		return false
+	}
+
+	for _, c := range s {
+		if !validateKeyChar(c) {
+			return false
+		}
+	}
+
+	return true
+}
+
+func validateKeyChar(c int32) bool {
+	return c >= 0 && c < int32(utf8.RuneSelf) && safeKeyCharset[c]
+}
+
+// validateValue checks if the string is a valid W3C Baggage value.
+func validateValue(s string) bool {
+	for _, c := range s {
+		if !validateValueChar(c) {
+			return false
+		}
+	}
+
+	return true
+}
+
+var safeValueCharset = [utf8.RuneSelf]bool{
+	'!': true, // 0x21
+
+	// 0x23 to 0x2b
+	'#':  true,
+	'$':  true,
+	'%':  true,
+	'&':  true,
+	'\'': true,
+	'(':  true,
+	')':  true,
+	'*':  true,
+	'+':  true,
+
+	// 0x2d to 0x3a
+	'-': true,
+	'.': true,
+	'/': true,
+	'0': true,
+	'1': true,
+	'2': true,
+	'3': true,
+	'4': true,
+	'5': true,
+	'6': true,
+	'7': true,
+	'8': true,
+	'9': true,
+	':': true,
+
+	// 0x3c to 0x5b
+	'<': true, // 0x3C
+	'=': true, // 0x3D
+	'>': true, // 0x3E
+	'?': true, // 0x3F
+	'@': true, // 0x40
+	'A': true, // 0x41
+	'B': true, // 0x42
+	'C': true, // 0x43
+	'D': true, // 0x44
+	'E': true, // 0x45
+	'F': true, // 0x46
+	'G': true, // 0x47
+	'H': true, // 0x48
+	'I': true, // 0x49
+	'J': true, // 0x4A
+	'K': true, // 0x4B
+	'L': true, // 0x4C
+	'M': true, // 0x4D
+	'N': true, // 0x4E
+	'O': true, // 0x4F
+	'P': true, // 0x50
+	'Q': true, // 0x51
+	'R': true, // 0x52
+	'S': true, // 0x53
+	'T': true, // 0x54
+	'U': true, // 0x55
+	'V': true, // 0x56
+	'W': true, // 0x57
+	'X': true, // 0x58
+	'Y': true, // 0x59
+	'Z': true, // 0x5A
+	'[': true, // 0x5B
+
+	// 0x5d to 0x7e
+	']': true, // 0x5D
+	'^': true, // 0x5E
+	'_': true, // 0x5F
+	'`': true, // 0x60
+	'a': true, // 0x61
+	'b': true, // 0x62
+	'c': true, // 0x63
+	'd': true, // 0x64
+	'e': true, // 0x65
+	'f': true, // 0x66
+	'g': true, // 0x67
+	'h': true, // 0x68
+	'i': true, // 0x69
+	'j': true, // 0x6A
+	'k': true, // 0x6B
+	'l': true, // 0x6C
+	'm': true, // 0x6D
+	'n': true, // 0x6E
+	'o': true, // 0x6F
+	'p': true, // 0x70
+	'q': true, // 0x71
+	'r': true, // 0x72
+	's': true, // 0x73
+	't': true, // 0x74
+	'u': true, // 0x75
+	'v': true, // 0x76
+	'w': true, // 0x77
+	'x': true, // 0x78
+	'y': true, // 0x79
+	'z': true, // 0x7A
+	'{': true, // 0x7B
+	'|': true, // 0x7C
+	'}': true, // 0x7D
+	'~': true, // 0x7E
+}
+
+func validateValueChar(c int32) bool {
+	return c >= 0 && c < int32(utf8.RuneSelf) && safeValueCharset[c]
+}
+
+// valueEscape escapes the string so it can be safely placed inside a baggage value,
+// replacing special characters with %XX sequences as needed.
+//
+// The implementation is based on:
+// https://github.com/golang/go/blob/f6509cf5cdbb5787061b784973782933c47f1782/src/net/url/url.go#L285.
+func valueEscape(s string) string {
+	hexCount := 0
+	for i := 0; i < len(s); i++ {
+		c := s[i]
+		if shouldEscape(c) {
+			hexCount++
+		}
+	}
+
+	if hexCount == 0 {
+		return s
+	}
+
+	var buf [64]byte
+	var t []byte
+
+	required := len(s) + 2*hexCount
+	if required <= len(buf) {
+		t = buf[:required]
+	} else {
+		t = make([]byte, required)
+	}
+
+	j := 0
+	for i := 0; i < len(s); i++ {
+		c := s[i]
+		if shouldEscape(s[i]) {
+			const upperhex = "0123456789ABCDEF"
+			t[j] = '%'
+			t[j+1] = upperhex[c>>4]
+			t[j+2] = upperhex[c&15]
+			j += 3
+		} else {
+			t[j] = c
+			j++
+		}
+	}
+
+	return string(t)
+}
+
+// shouldEscape returns true if the specified byte should be escaped when
+// appearing in a baggage value string.
+func shouldEscape(c byte) bool {
+	if c == '%' {
+		// The percent character must be encoded so that percent-encoding can work.
+		return true
+	}
+	return !validateValueChar(int32(c))
+}