diff --git a/packages/share/src/util/index.util.ts b/packages/share/src/util/index.util.ts
index c20602544..7cd785a29 100644
--- a/packages/share/src/util/index.util.ts
+++ b/packages/share/src/util/index.util.ts
@@ -5,4 +5,5 @@ export * from './common.js'
 export * from './date.js'
 export * from './dto.util.js'
 export * from './web-context.js'
+export * from './request.js'
 
diff --git a/packages/share/src/util/request.ts b/packages/share/src/util/request.ts
new file mode 100644
index 000000000..c8d3d7507
--- /dev/null
+++ b/packages/share/src/util/request.ts
@@ -0,0 +1,130 @@
+import type { IncomingHttpHeaders, OutgoingHttpHeaders } from 'node:http2'
+
+import type { Context } from '../lib/types.js'
+
+
+export interface GrpcContext {
+  /**
+   * @example 'SayHello'
+   */
+  method: string
+  /**
+   * @example '/helloworld.Greeter/SayHello'
+   */
+  path: string
+  cancelled: boolean
+  destroyed: boolean
+  errored: unknown
+  call: object
+  metadata?: Metadata | null
+  pendingStatus: { code: number, details: string }
+  /** request data */
+  request: Record<string, unknown>
+  requestContext: object
+  writable: boolean
+  writableAborted: boolean
+  writableBuffer: Buffer
+  writableEnded: boolean
+  writableFinished: boolean
+  writableLength: number
+}
+
+/**
+ * @returns 'http' | 'grpc' | ''
+ */
+export function retrieveRequestProtocolFromCtx(ctx: Context | GrpcContext): string {
+  if (typeof ctx.request === 'object'
+    && ctx.request.protocol
+    && typeof ctx.request.protocol === 'string'
+    && typeof ctx.call === 'undefined') { // http
+    return ctx.request.protocol
+  }
+
+  if (typeof ctx.call === 'object' && typeof ctx.writable === 'boolean') { // grpc
+    return 'grpc'
+  }
+
+  return ''
+}
+
+
+/**
+ * A class for storing metadata. Keys are normalized to lowercase ASCII.
+ * Copy from nice-grpc/packages/nice-grpc-common/src/Metadata.ts
+ */
+export interface Metadata {
+  readonly options: object
+
+  /**
+   * Sets the given value for the given key by replacing any other values
+   * associated with that key. Normalizes the key.
+   * @param key The key to whose value should be set.
+   * @param value The value to set. Must be a buffer if and only
+   *   if the normalized key ends with '-bin'.
+   */
+  set(key: string, value: MetadataValue): void
+  /**
+   * Adds the given value for the given key by appending to a list of previous
+   * values associated with that key. Normalizes the key.
+   * @param key The key for which a new value should be appended.
+   * @param value The value to add. Must be a buffer if and only
+   *   if the normalized key ends with '-bin'.
+   */
+  add(key: string, value: MetadataValue): void
+  /**
+   * Removes the given key and any associated values. Normalizes the key.
+   * @param key The key whose values should be removed.
+   */
+  remove(key: string): void
+  /**
+   * Gets a list of all values associated with the key. Normalizes the key.
+   * @param key The key whose value should be retrieved.
+   * @return A list of values associated with the given key.
+   */
+  get(key: string): MetadataValue[]
+  /**
+   * Gets a plain object mapping each key to the first value associated with it.
+   * This reflects the most common way that people will want to see metadata.
+   * @return A key/value mapping of the metadata.
+   */
+  getMap(): Record<string, MetadataValue>
+  /**
+   * Clones the metadata object.
+   * @return The newly cloned object.
+   */
+  clone(): Metadata
+  /**
+   * Merges all key-value pairs from a given Metadata object into this one.
+   * If both this object and the given object have values in the same key,
+   * values from the other Metadata object will be appended to this object's
+   * values.
+   * @param other A Metadata object.
+   */
+  merge(other: Metadata): void
+  setOptions(options: MetadataOptions): void
+  getOptions(): MetadataOptions
+  /**
+   * Creates an OutgoingHttpHeaders object that can be used with the http2 API.
+   */
+  toHttp2Headers(): OutgoingHttpHeaders
+  /**
+   * This modifies the behavior of JSON.stringify to show an object
+   * representation of the metadata map.
+   */
+  toJSON(): Record<string, MetadataValue[]>
+  /**
+   * Returns a new Metadata object based fields in a given IncomingHttpHeaders
+   * object.
+   * @param headers An IncomingHttpHeaders object.
+   */
+  fromHttp2Headers(headers: IncomingHttpHeaders): Metadata
+}
+
+type MetadataValue = string | Buffer
+// type MetadataObject = Map<string, MetadataValue[]>
+interface MetadataOptions {
+  idempotentRequest?: boolean
+  waitForReady?: boolean
+  cacheableRequest?: boolean
+  corked?: boolean
+}
diff --git a/packages/share/test/lib/util/301.request.test.ts b/packages/share/test/lib/util/301.request.test.ts
new file mode 100644
index 000000000..ce26bac31
--- /dev/null
+++ b/packages/share/test/lib/util/301.request.test.ts
@@ -0,0 +1,37 @@
+import assert from 'node:assert'
+
+import { fileShortPath } from '@waiting/shared-core'
+
+import { type Context, type GrpcContext, retrieveRequestProtocolFromCtx } from '##/index.js'
+
+
+describe.only(fileShortPath(import.meta.url), function () {
+  describe(`retrieveRequestProtocolFromCtx()`, async () => {
+    it(`http`, async () => {
+      const protocol = retrieveRequestProtocolFromCtx({
+        request: {
+          protocol: 'http',
+        },
+      } as Context)
+
+      assert(protocol === 'http')
+    })
+
+    it(`grpc`, async () => {
+      const protocol = retrieveRequestProtocolFromCtx({
+        call: {},
+        writable: true,
+      } as GrpcContext)
+
+      assert(protocol === 'grpc')
+    })
+
+    it(`empty`, async () => {
+      const protocol = retrieveRequestProtocolFromCtx({ } as GrpcContext)
+      assert(protocol === '')
+    })
+  })
+
+})
+
+