diff --git a/docs/http/http-metrics.md b/docs/http/http-metrics.md
index 5341a8524b..4bef020005 100644
--- a/docs/http/http-metrics.md
+++ b/docs/http/http-metrics.md
@@ -80,9 +80,10 @@ of `[ 0.005, 0.01, 0.025, 0.05, 0.075, 0.1, 0.25, 0.5, 0.75, 1, 2.5, 5, 7.5, 10
 | [`http.request.method`](../attributes-registry/http.md) | string | HTTP request method. [2] | `GET`; `POST`; `HEAD` | Required |
 | [`http.response.status_code`](../attributes-registry/http.md) | int | [HTTP response status code](https://tools.ietf.org/html/rfc7231#section-6). | `200` | Conditionally Required: If and only if one was received/sent. |
 | [`http.route`](../attributes-registry/http.md) | string | The matched route (path template in the format used by the respective server framework). See note below [3] | `/users/:userID?`; `{controller}/{action}/{id?}` | Conditionally Required: If and only if it's available |
-| [`network.protocol.version`](../general/attributes.md) | string | Version of the protocol specified in `network.protocol.name`. [4] | `1.0`; `1.1`; `2`; `3` | Recommended |
-| [`server.address`](../general/attributes.md) | string | Name of the local HTTP server that received the request. [5] | `example.com`; `10.1.2.80`; `/tmp/my.sock` | Opt-In |
-| [`server.port`](../general/attributes.md) | int | Port of the local HTTP server that received the request. [6] | `80`; `8080`; `443` | Opt-In |
+| [`network.protocol.name`](../general/attributes.md) | string | [OSI application layer](https://osi-model.com/application-layer/) or non-OSI equivalent. [4] | `http`; `spdy` | Opt-In |
+| [`network.protocol.version`](../general/attributes.md) | string | Version of the protocol specified in `network.protocol.name`. [5] | `1.0`; `1.1`; `2`; `3` | Recommended |
+| [`server.address`](../general/attributes.md) | string | Name of the local HTTP server that received the request. [6] | `example.com`; `10.1.2.80`; `/tmp/my.sock` | Opt-In |
+| [`server.port`](../general/attributes.md) | int | Port of the local HTTP server that received the request. [7] | `80`; `8080`; `443` | Opt-In |
 | [`url.scheme`](../url/url.md) | string | The [URI scheme](https://www.rfc-editor.org/rfc/rfc3986#section-3.1) component identifying the used protocol. | `http`; `https` | Required |
 
 **[1]:** If the request fails with an error before response status code was sent or received,
@@ -120,9 +121,11 @@ Tracing instrumentations that do so, MUST also set `http.request.method_original
 **[3]:** MUST NOT be populated when this is not supported by the HTTP server framework as the route attribute should have low-cardinality and the URI path can NOT substitute it.
 SHOULD include the [application root](/docs/http/http-spans.md#http-server-definitions) if there is one.
 
-**[4]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+**[4]:** The value SHOULD be normalized to lowercase.
 
-**[5]:** Determined by using the first of the following that applies
+**[5]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+
+**[6]:** Determined by using the first of the following that applies
 
 - The [primary server name](/docs/http/http-spans.md#http-server-definitions) of the matched virtual host. MUST only
   include host identifier.
@@ -132,7 +135,7 @@ SHOULD include the [application root](/docs/http/http-spans.md#http-server-defin
 
 SHOULD NOT be set if only IP address is available and capturing name would require a reverse DNS lookup.
 
-**[6]:** Determined by using the first of the following that applies
+**[7]:** Determined by using the first of the following that applies
 
 - Port identifier of the [primary server host](/docs/http/http-spans.md#http-server-definitions) of the matched virtual host.
 - Port identifier of the [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource)
@@ -256,9 +259,10 @@ This metric is optional.
 | [`http.request.method`](../attributes-registry/http.md) | string | HTTP request method. [2] | `GET`; `POST`; `HEAD` | Required |
 | [`http.response.status_code`](../attributes-registry/http.md) | int | [HTTP response status code](https://tools.ietf.org/html/rfc7231#section-6). | `200` | Conditionally Required: If and only if one was received/sent. |
 | [`http.route`](../attributes-registry/http.md) | string | The matched route (path template in the format used by the respective server framework). See note below [3] | `/users/:userID?`; `{controller}/{action}/{id?}` | Conditionally Required: If and only if it's available |
-| [`network.protocol.version`](../general/attributes.md) | string | Version of the protocol specified in `network.protocol.name`. [4] | `1.0`; `1.1`; `2`; `3` | Recommended |
-| [`server.address`](../general/attributes.md) | string | Name of the local HTTP server that received the request. [5] | `example.com`; `10.1.2.80`; `/tmp/my.sock` | Opt-In |
-| [`server.port`](../general/attributes.md) | int | Port of the local HTTP server that received the request. [6] | `80`; `8080`; `443` | Opt-In |
+| [`network.protocol.name`](../general/attributes.md) | string | [OSI application layer](https://osi-model.com/application-layer/) or non-OSI equivalent. [4] | `http`; `spdy` | Opt-In |
+| [`network.protocol.version`](../general/attributes.md) | string | Version of the protocol specified in `network.protocol.name`. [5] | `1.0`; `1.1`; `2`; `3` | Recommended |
+| [`server.address`](../general/attributes.md) | string | Name of the local HTTP server that received the request. [6] | `example.com`; `10.1.2.80`; `/tmp/my.sock` | Opt-In |
+| [`server.port`](../general/attributes.md) | int | Port of the local HTTP server that received the request. [7] | `80`; `8080`; `443` | Opt-In |
 | [`url.scheme`](../url/url.md) | string | The [URI scheme](https://www.rfc-editor.org/rfc/rfc3986#section-3.1) component identifying the used protocol. | `http`; `https` | Required |
 
 **[1]:** If the request fails with an error before response status code was sent or received,
@@ -296,9 +300,11 @@ Tracing instrumentations that do so, MUST also set `http.request.method_original
 **[3]:** MUST NOT be populated when this is not supported by the HTTP server framework as the route attribute should have low-cardinality and the URI path can NOT substitute it.
 SHOULD include the [application root](/docs/http/http-spans.md#http-server-definitions) if there is one.
 
-**[4]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+**[4]:** The value SHOULD be normalized to lowercase.
 
-**[5]:** Determined by using the first of the following that applies
+**[5]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+
+**[6]:** Determined by using the first of the following that applies
 
 - The [primary server name](/docs/http/http-spans.md#http-server-definitions) of the matched virtual host. MUST only
   include host identifier.
@@ -308,7 +314,7 @@ SHOULD include the [application root](/docs/http/http-spans.md#http-server-defin
 
 SHOULD NOT be set if only IP address is available and capturing name would require a reverse DNS lookup.
 
-**[6]:** Determined by using the first of the following that applies
+**[7]:** Determined by using the first of the following that applies
 
 - Port identifier of the [primary server host](/docs/http/http-spans.md#http-server-definitions) of the matched virtual host.
 - Port identifier of the [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource)
@@ -358,9 +364,10 @@ This metric is optional.
 | [`http.request.method`](../attributes-registry/http.md) | string | HTTP request method. [2] | `GET`; `POST`; `HEAD` | Required |
 | [`http.response.status_code`](../attributes-registry/http.md) | int | [HTTP response status code](https://tools.ietf.org/html/rfc7231#section-6). | `200` | Conditionally Required: If and only if one was received/sent. |
 | [`http.route`](../attributes-registry/http.md) | string | The matched route (path template in the format used by the respective server framework). See note below [3] | `/users/:userID?`; `{controller}/{action}/{id?}` | Conditionally Required: If and only if it's available |
-| [`network.protocol.version`](../general/attributes.md) | string | Version of the protocol specified in `network.protocol.name`. [4] | `1.0`; `1.1`; `2`; `3` | Recommended |
-| [`server.address`](../general/attributes.md) | string | Name of the local HTTP server that received the request. [5] | `example.com`; `10.1.2.80`; `/tmp/my.sock` | Opt-In |
-| [`server.port`](../general/attributes.md) | int | Port of the local HTTP server that received the request. [6] | `80`; `8080`; `443` | Opt-In |
+| [`network.protocol.name`](../general/attributes.md) | string | [OSI application layer](https://osi-model.com/application-layer/) or non-OSI equivalent. [4] | `http`; `spdy` | Opt-In |
+| [`network.protocol.version`](../general/attributes.md) | string | Version of the protocol specified in `network.protocol.name`. [5] | `1.0`; `1.1`; `2`; `3` | Recommended |
+| [`server.address`](../general/attributes.md) | string | Name of the local HTTP server that received the request. [6] | `example.com`; `10.1.2.80`; `/tmp/my.sock` | Opt-In |
+| [`server.port`](../general/attributes.md) | int | Port of the local HTTP server that received the request. [7] | `80`; `8080`; `443` | Opt-In |
 | [`url.scheme`](../url/url.md) | string | The [URI scheme](https://www.rfc-editor.org/rfc/rfc3986#section-3.1) component identifying the used protocol. | `http`; `https` | Required |
 
 **[1]:** If the request fails with an error before response status code was sent or received,
@@ -398,9 +405,11 @@ Tracing instrumentations that do so, MUST also set `http.request.method_original
 **[3]:** MUST NOT be populated when this is not supported by the HTTP server framework as the route attribute should have low-cardinality and the URI path can NOT substitute it.
 SHOULD include the [application root](/docs/http/http-spans.md#http-server-definitions) if there is one.
 
-**[4]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+**[4]:** The value SHOULD be normalized to lowercase.
 
-**[5]:** Determined by using the first of the following that applies
+**[5]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+
+**[6]:** Determined by using the first of the following that applies
 
 - The [primary server name](/docs/http/http-spans.md#http-server-definitions) of the matched virtual host. MUST only
   include host identifier.
@@ -410,7 +419,7 @@ SHOULD include the [application root](/docs/http/http-spans.md#http-server-defin
 
 SHOULD NOT be set if only IP address is available and capturing name would require a reverse DNS lookup.
 
-**[6]:** Determined by using the first of the following that applies
+**[7]:** Determined by using the first of the following that applies
 
 - Port identifier of the [primary server host](/docs/http/http-spans.md#http-server-definitions) of the matched virtual host.
 - Port identifier of the [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource)
@@ -465,9 +474,10 @@ of `[ 0.005, 0.01, 0.025, 0.05, 0.075, 0.1, 0.25, 0.5, 0.75, 1, 2.5, 5, 7.5, 10
 | `error.type` | string | Describes a class of error the operation ended with. [1] | `timeout`; `java.net.UnknownHostException`; `server_certificate_invalid`; `500` | Conditionally Required: If request has ended with an error. |
 | [`http.request.method`](../attributes-registry/http.md) | string | HTTP request method. [2] | `GET`; `POST`; `HEAD` | Required |
 | [`http.response.status_code`](../attributes-registry/http.md) | int | [HTTP response status code](https://tools.ietf.org/html/rfc7231#section-6). | `200` | Conditionally Required: If and only if one was received/sent. |
-| [`network.protocol.version`](../general/attributes.md) | string | Version of the protocol specified in `network.protocol.name`. [3] | `1.0`; `1.1`; `2`; `3` | Recommended |
-| [`server.address`](../general/attributes.md) | string | Host identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [4] | `example.com`; `10.1.2.80`; `/tmp/my.sock` | Required |
-| [`server.port`](../general/attributes.md) | int | Port identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [5] | `80`; `8080`; `443` | Conditionally Required: [6] |
+| [`network.protocol.name`](../general/attributes.md) | string | [OSI application layer](https://osi-model.com/application-layer/) or non-OSI equivalent. [3] | `http`; `spdy` | Opt-In |
+| [`network.protocol.version`](../general/attributes.md) | string | Version of the protocol specified in `network.protocol.name`. [4] | `1.0`; `1.1`; `2`; `3` | Recommended |
+| [`server.address`](../general/attributes.md) | string | Host identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [5] | `example.com`; `10.1.2.80`; `/tmp/my.sock` | Required |
+| [`server.port`](../general/attributes.md) | int | Port identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [6] | `80`; `8080`; `443` | Conditionally Required: [7] |
 | [`url.scheme`](../url/url.md) | string | The [URI scheme](https://www.rfc-editor.org/rfc/rfc3986#section-3.1) component identifying the used protocol. | `https`; `ftp`; `telnet` | Required |
 
 **[1]:** If the request fails with an error before response status code was sent or received,
@@ -502,9 +512,11 @@ HTTP method names are case-sensitive and `http.request.method` attribute value M
 Instrumentations for specific web frameworks that consider HTTP methods to be case insensitive, SHOULD populate a canonical equivalent.
 Tracing instrumentations that do so, MUST also set `http.request.method_original` to the original value.
 
-**[3]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+**[3]:** The value SHOULD be normalized to lowercase.
 
-**[4]:** Determined by using the first of the following that applies
+**[4]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+
+**[5]:** Determined by using the first of the following that applies
 
 - Host identifier of the [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource)
   if it's sent in absolute-form
@@ -513,9 +525,9 @@ Tracing instrumentations that do so, MUST also set `http.request.method_original
 If an HTTP client request is explicitly made to an IP address, e.g. `http://x.x.x.x:8080`, then
 `server.address` SHOULD be the IP address `x.x.x.x`. A DNS lookup SHOULD NOT be used.
 
-**[5]:** When [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource) is absolute URI, `server.port` MUST match URI port identifier, otherwise it MUST match `Host` header port identifier.
+**[6]:** When [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource) is absolute URI, `server.port` MUST match URI port identifier, otherwise it MUST match `Host` header port identifier.
 
-**[6]:** If not default (`80` for `http` scheme, `443` for `https`).
+**[7]:** If not default (`80` for `http` scheme, `443` for `https`).
 
 `error.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used, otherwise a custom value MAY be used.
 
@@ -559,9 +571,10 @@ This metric is optional.
 | `error.type` | string | Describes a class of error the operation ended with. [1] | `timeout`; `java.net.UnknownHostException`; `server_certificate_invalid`; `500` | Conditionally Required: If request has ended with an error. |
 | [`http.request.method`](../attributes-registry/http.md) | string | HTTP request method. [2] | `GET`; `POST`; `HEAD` | Required |
 | [`http.response.status_code`](../attributes-registry/http.md) | int | [HTTP response status code](https://tools.ietf.org/html/rfc7231#section-6). | `200` | Conditionally Required: If and only if one was received/sent. |
-| [`network.protocol.version`](../general/attributes.md) | string | Version of the protocol specified in `network.protocol.name`. [3] | `1.0`; `1.1`; `2`; `3` | Recommended |
-| [`server.address`](../general/attributes.md) | string | Host identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [4] | `example.com`; `10.1.2.80`; `/tmp/my.sock` | Required |
-| [`server.port`](../general/attributes.md) | int | Port identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [5] | `80`; `8080`; `443` | Conditionally Required: [6] |
+| [`network.protocol.name`](../general/attributes.md) | string | [OSI application layer](https://osi-model.com/application-layer/) or non-OSI equivalent. [3] | `http`; `spdy` | Opt-In |
+| [`network.protocol.version`](../general/attributes.md) | string | Version of the protocol specified in `network.protocol.name`. [4] | `1.0`; `1.1`; `2`; `3` | Recommended |
+| [`server.address`](../general/attributes.md) | string | Host identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [5] | `example.com`; `10.1.2.80`; `/tmp/my.sock` | Required |
+| [`server.port`](../general/attributes.md) | int | Port identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [6] | `80`; `8080`; `443` | Conditionally Required: [7] |
 | [`url.scheme`](../url/url.md) | string | The [URI scheme](https://www.rfc-editor.org/rfc/rfc3986#section-3.1) component identifying the used protocol. | `https`; `ftp`; `telnet` | Required |
 
 **[1]:** If the request fails with an error before response status code was sent or received,
@@ -596,9 +609,11 @@ HTTP method names are case-sensitive and `http.request.method` attribute value M
 Instrumentations for specific web frameworks that consider HTTP methods to be case insensitive, SHOULD populate a canonical equivalent.
 Tracing instrumentations that do so, MUST also set `http.request.method_original` to the original value.
 
-**[3]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+**[3]:** The value SHOULD be normalized to lowercase.
 
-**[4]:** Determined by using the first of the following that applies
+**[4]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+
+**[5]:** Determined by using the first of the following that applies
 
 - Host identifier of the [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource)
   if it's sent in absolute-form
@@ -607,9 +622,9 @@ Tracing instrumentations that do so, MUST also set `http.request.method_original
 If an HTTP client request is explicitly made to an IP address, e.g. `http://x.x.x.x:8080`, then
 `server.address` SHOULD be the IP address `x.x.x.x`. A DNS lookup SHOULD NOT be used.
 
-**[5]:** When [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource) is absolute URI, `server.port` MUST match URI port identifier, otherwise it MUST match `Host` header port identifier.
+**[6]:** When [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource) is absolute URI, `server.port` MUST match URI port identifier, otherwise it MUST match `Host` header port identifier.
 
-**[6]:** If not default (`80` for `http` scheme, `443` for `https`).
+**[7]:** If not default (`80` for `http` scheme, `443` for `https`).
 
 `error.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used, otherwise a custom value MAY be used.
 
@@ -653,9 +668,10 @@ This metric is optional.
 | `error.type` | string | Describes a class of error the operation ended with. [1] | `timeout`; `java.net.UnknownHostException`; `server_certificate_invalid`; `500` | Conditionally Required: If request has ended with an error. |
 | [`http.request.method`](../attributes-registry/http.md) | string | HTTP request method. [2] | `GET`; `POST`; `HEAD` | Required |
 | [`http.response.status_code`](../attributes-registry/http.md) | int | [HTTP response status code](https://tools.ietf.org/html/rfc7231#section-6). | `200` | Conditionally Required: If and only if one was received/sent. |
-| [`network.protocol.version`](../general/attributes.md) | string | Version of the protocol specified in `network.protocol.name`. [3] | `1.0`; `1.1`; `2`; `3` | Recommended |
-| [`server.address`](../general/attributes.md) | string | Host identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [4] | `example.com`; `10.1.2.80`; `/tmp/my.sock` | Required |
-| [`server.port`](../general/attributes.md) | int | Port identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [5] | `80`; `8080`; `443` | Conditionally Required: [6] |
+| [`network.protocol.name`](../general/attributes.md) | string | [OSI application layer](https://osi-model.com/application-layer/) or non-OSI equivalent. [3] | `http`; `spdy` | Opt-In |
+| [`network.protocol.version`](../general/attributes.md) | string | Version of the protocol specified in `network.protocol.name`. [4] | `1.0`; `1.1`; `2`; `3` | Recommended |
+| [`server.address`](../general/attributes.md) | string | Host identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [5] | `example.com`; `10.1.2.80`; `/tmp/my.sock` | Required |
+| [`server.port`](../general/attributes.md) | int | Port identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [6] | `80`; `8080`; `443` | Conditionally Required: [7] |
 | [`url.scheme`](../url/url.md) | string | The [URI scheme](https://www.rfc-editor.org/rfc/rfc3986#section-3.1) component identifying the used protocol. | `https`; `ftp`; `telnet` | Required |
 
 **[1]:** If the request fails with an error before response status code was sent or received,
@@ -690,9 +706,11 @@ HTTP method names are case-sensitive and `http.request.method` attribute value M
 Instrumentations for specific web frameworks that consider HTTP methods to be case insensitive, SHOULD populate a canonical equivalent.
 Tracing instrumentations that do so, MUST also set `http.request.method_original` to the original value.
 
-**[3]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+**[3]:** The value SHOULD be normalized to lowercase.
 
-**[4]:** Determined by using the first of the following that applies
+**[4]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+
+**[5]:** Determined by using the first of the following that applies
 
 - Host identifier of the [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource)
   if it's sent in absolute-form
@@ -701,9 +719,9 @@ Tracing instrumentations that do so, MUST also set `http.request.method_original
 If an HTTP client request is explicitly made to an IP address, e.g. `http://x.x.x.x:8080`, then
 `server.address` SHOULD be the IP address `x.x.x.x`. A DNS lookup SHOULD NOT be used.
 
-**[5]:** When [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource) is absolute URI, `server.port` MUST match URI port identifier, otherwise it MUST match `Host` header port identifier.
+**[6]:** When [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource) is absolute URI, `server.port` MUST match URI port identifier, otherwise it MUST match `Host` header port identifier.
 
-**[6]:** If not default (`80` for `http` scheme, `443` for `https`).
+**[7]:** If not default (`80` for `http` scheme, `443` for `https`).
 
 `error.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used, otherwise a custom value MAY be used.
 
diff --git a/docs/http/http-spans.md b/docs/http/http-spans.md
index 7150b37a61..b10181cf1a 100644
--- a/docs/http/http-spans.md
+++ b/docs/http/http-spans.md
@@ -123,9 +123,10 @@ sections below.
 | [`http.response.body.size`](../attributes-registry/http.md) | int | The size of the response payload body in bytes. This is the number of bytes transferred excluding headers and is often, but not always, present as the [Content-Length](https://www.rfc-editor.org/rfc/rfc9110.html#field.content-length) header. For requests using transport encoding, this should be the compressed size. | `3495` | Recommended |
 | [`http.response.header.<key>`](../attributes-registry/http.md) | string[] | HTTP response headers, `<key>` being the normalized HTTP Header name (lowercase, with `-` characters replaced by `_`), the value being the header values. [5] | `http.response.header.content_type=["application/json"]`; `http.response.header.my_custom_header=["abc", "def"]` | Opt-In |
 | [`http.response.status_code`](../attributes-registry/http.md) | int | [HTTP response status code](https://tools.ietf.org/html/rfc7231#section-6). | `200` | Conditionally Required: If and only if one was received/sent. |
-| [`network.protocol.version`](../general/attributes.md) | string | Version of the protocol specified in `network.protocol.name`. [6] | `1.0`; `1.1`; `2`; `3` | Recommended |
-| [`network.transport`](../general/attributes.md) | string | [OSI transport layer](https://osi-model.com/transport-layer/) or [inter-process communication method](https://en.wikipedia.org/wiki/Inter-process_communication). [7] | `tcp`; `udp` | Conditionally Required: [8] |
-| [`network.type`](../general/attributes.md) | string | [OSI network layer](https://osi-model.com/network-layer/) or non-OSI equivalent. [9] | `ipv4`; `ipv6` | Recommended |
+| [`network.protocol.name`](../general/attributes.md) | string | [OSI application layer](https://osi-model.com/application-layer/) or non-OSI equivalent. [6] | `http`; `spdy` | Opt-In |
+| [`network.protocol.version`](../general/attributes.md) | string | Version of the protocol specified in `network.protocol.name`. [7] | `1.0`; `1.1`; `2`; `3` | Recommended |
+| [`network.transport`](../general/attributes.md) | string | [OSI transport layer](https://osi-model.com/transport-layer/) or [inter-process communication method](https://en.wikipedia.org/wiki/Inter-process_communication). [8] | `tcp`; `udp` | Conditionally Required: [9] |
+| [`network.type`](../general/attributes.md) | string | [OSI network layer](https://osi-model.com/network-layer/) or non-OSI equivalent. [10] | `ipv4`; `ipv6` | Recommended |
 | `user_agent.original` | string | Value of the [HTTP User-Agent](https://www.rfc-editor.org/rfc/rfc9110.html#field.user-agent) header sent by the client. | `CERN-LineMode/2.15 libwww/2.17b3` | Recommended |
 
 **[1]:** If the request fails with an error before response status code was sent or received,
@@ -170,17 +171,19 @@ Tracing instrumentations that do so, MUST also set `http.request.method_original
 Users MAY explicitly configure instrumentations to capture them even though it is not recommended.
 The attribute value MUST consist of either multiple header values as an array of strings or a single-item array containing a possibly comma-concatenated string, depending on the way the HTTP library provides access to headers.
 
-**[6]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+**[6]:** The value SHOULD be normalized to lowercase.
 
-**[7]:** The value SHOULD be normalized to lowercase.
+**[7]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+
+**[8]:** The value SHOULD be normalized to lowercase.
 
 Consider always setting the transport when setting a port number, since
 a port number is ambiguous without knowing the transport, for example
 different processes could be listening on TCP port 12345 and UDP port 12345.
 
-**[8]:** If not default (`tcp` for `HTTP/1.1` and `HTTP/2`, `udp` for `HTTP/3`).
+**[9]:** If not default (`tcp` for `HTTP/1.1` and `HTTP/2`, `udp` for `HTTP/3`).
 
-**[9]:** The value SHOULD be normalized to lowercase.
+**[10]:** The value SHOULD be normalized to lowercase.
 
 Following attributes MUST be provided **at span creation time** (when provided at all), so they can be considered for sampling decisions:
 
diff --git a/model/http-common.yaml b/model/http-common.yaml
index e2d3edfcfc..7cc6b936b5 100644
--- a/model/http-common.yaml
+++ b/model/http-common.yaml
@@ -29,6 +29,9 @@ groups:
           additional filters are applied.
 
           If the request has completed successfully, instrumentations SHOULD NOT set `error.type`.
+      - ref: network.protocol.name
+        examples: ['http', 'spdy']
+        requirement_level: opt_in
       - ref: network.protocol.version
         examples: ['1.0', '1.1', '2', '3']