diff --git a/modules/http_client/CHANGELOG.md b/modules/http_client/CHANGELOG.md
index 36b97b3..78fcc6f 100644
--- a/modules/http_client/CHANGELOG.md
+++ b/modules/http_client/CHANGELOG.md
@@ -5,6 +5,27 @@ All notable changes to `dream_http_client` will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## 5.1.2 - 2026-03-03
+
+### Fixed
+
+- **Query parameters are now included in HTTP requests.** `build_url` in
+  `client.gleam` constructed the URL from scheme, host, port, and path but
+  never appended the query string. Any caller using `.query("key=value")`
+  silently sent requests without query parameters. Affects `send()` and
+  `start_stream()`.
+- **`stream_yielder()` also dropped query parameters.** `start_httpc_stream`
+  in `internal.gleam` had its own URL construction that independently omitted
+  the query string — a separate code path from the `build_url` fix above.
+
+### Added
+
+- **8 regression tests** covering query parameter delivery across all three
+  execution modes (`send`, `stream_yielder`, `start_stream`), recorder
+  integration (record + playback round-trip), URL-encoded special characters,
+  and the empty query string edge case. All assertions parse the JSON `query`
+  field from the mock server's response for exact matching.
+
 ## 5.1.1 - 2026-03-01
 
 ### Fixed
diff --git a/modules/http_client/gleam.toml b/modules/http_client/gleam.toml
index 19b7979..0fb3568 100644
--- a/modules/http_client/gleam.toml
+++ b/modules/http_client/gleam.toml
@@ -1,5 +1,5 @@
 name = "dream_http_client"
-version = "5.1.1"
+version = "5.1.2"
 description = "Type-safe HTTP client for Gleam with streaming support"
 licences = ["MIT"]
 repository = { type = "github", user = "TrustBound", repo = "dream" }
diff --git a/modules/http_client/releases/release-5.1.2.md b/modules/http_client/releases/release-5.1.2.md
new file mode 100644
index 0000000..f190923
--- /dev/null
+++ b/modules/http_client/releases/release-5.1.2.md
@@ -0,0 +1,79 @@
+# dream_http_client v5.1.2
+
+**Release Date:** March 3, 2026
+
+This patch release fixes a bug where query parameters set via `.query()` were
+silently dropped from outgoing HTTP requests across all three execution modes.
+
+No API changes -- this is a fully transparent bug fix.
+
+---
+
+## Bug Fix: Query parameters dropped from URLs
+
+### The problem
+
+The `query()` builder correctly stored the query string on the `ClientRequest`,
+and `to_http_request` correctly copied it to the `Request.query` field. But the
+final URL assembly step dropped it:
+
+- **`build_url` in `client.gleam`** constructed the URL from scheme, host, port,
+  and path — but never appended `?query`. This affected `send()` and
+  `start_stream()`.
+- **`start_httpc_stream` in `internal.gleam`** had its own independent URL
+  construction that also omitted the query string. This affected
+  `stream_yielder()`.
+
+Any caller using `.query("key=value")` silently sent requests without query
+parameters. The server never received them.
+
+### Why previous tests didn't catch it
+
+All existing tests hit mock server endpoints that don't vary by query string
+(`/text`, `/stream/fast`, etc.), so the absence of query parameters had no
+observable effect. The mock server's `GET /get` endpoint was documented as
+echoing query parameters, but the implementation only echoed the path — so even
+tests using that endpoint couldn't detect the bug (fixed in mock server v1.1.1).
+
+### The fix
+
+**`client.gleam` — `build_url`:**
+
+Added a case expression on `request.query`:
+- `Some(query)` → appends `"?" <> query` to the URL
+- `None` → no change (preserves existing behavior)
+
+**`internal.gleam` — `start_httpc_stream`:**
+
+Same fix applied to the independent URL construction used by `stream_yielder()`.
+
+### Regression tests (8 new tests, 185 total)
+
+All assertions parse the mock server's JSON `query` field for exact matching
+rather than substring checks.
+
+| Test | Execution mode | What it verifies |
+|---|---|---|
+| `send_includes_query_params_in_request` | `send()` | Query arrives at server |
+| `send_without_query_params_sends_empty_query` | `send()` | No query = empty string |
+| `send_with_special_characters_in_query` | `send()` | URL-encoded chars arrive verbatim |
+| `send_with_empty_query_string` | `send()` | Empty string edge case |
+| `stream_yielder_includes_query_params_in_request` | `stream_yielder()` | Query arrives via yielder path |
+| `start_stream_includes_query_params_in_request` | `start_stream()` | Query arrives via callback path |
+| `send_with_query_and_recorder_record_mode_preserves_query` | `send()` + recorder | Server receives query; recording captures it |
+| `send_with_query_and_recorder_playback_mode_matches_query` | `send()` + recorder | Record + playback round-trip with query |
+
+---
+
+## Files changed
+
+- `modules/http_client/src/dream_http_client/client.gleam` — `build_url` now
+  appends query string
+- `modules/http_client/src/dream_http_client/internal.gleam` —
+  `start_httpc_stream` now appends query string
+- `modules/http_client/test/recorder_client_test.gleam` — 8 new regression
+  tests
+- `modules/mock_server/src/dream_mock_server/controllers/api_controller.gleam`
+  — `GET /get` now passes `request.query` to the view
+- `modules/mock_server/src/dream_mock_server/views/api_view.gleam` —
+  `get_to_json` now includes `query` field in JSON response
diff --git a/modules/http_client/src/dream_http_client/client.gleam b/modules/http_client/src/dream_http_client/client.gleam
index 88120c6..2cc01bb 100644
--- a/modules/http_client/src/dream_http_client/client.gleam
+++ b/modules/http_client/src/dream_http_client/client.gleam
@@ -1783,11 +1783,16 @@ fn build_url(request: request.Request(String)) -> String {
     option.Some(port) -> ":" <> int.to_string(port)
     option.None -> ""
   }
+  let query_string = case request.query {
+    option.Some(query) -> "?" <> query
+    option.None -> ""
+  }
   http.scheme_to_string(request.scheme)
   <> "://"
   <> request.host
   <> port_string
   <> request.path
+  <> query_string
 }
 
 fn parse_stream_start_result(result: d.Dynamic) -> Result(RequestId, String) {
diff --git a/modules/http_client/src/dream_http_client/internal.gleam b/modules/http_client/src/dream_http_client/internal.gleam
index 15726b0..3dd95e1 100644
--- a/modules/http_client/src/dream_http_client/internal.gleam
+++ b/modules/http_client/src/dream_http_client/internal.gleam
@@ -90,12 +90,17 @@ pub fn start_httpc_stream(
     option.Some(port) -> ":" <> int.to_string(port)
     option.None -> ""
   }
+  let query_string = case request.query {
+    option.Some(query) -> "?" <> query
+    option.None -> ""
+  }
   let url =
     http.scheme_to_string(request.scheme)
     <> "://"
     <> request.host
     <> port_string
     <> request.path
+    <> query_string
   let method_atom = atomize_method(request.method)
   let body = <<request.body:utf8>>
   let receiver = process.self()
diff --git a/modules/http_client/test/recorder_client_test.gleam b/modules/http_client/test/recorder_client_test.gleam
index 908ac4c..3cb3a15 100644
--- a/modules/http_client/test/recorder_client_test.gleam
+++ b/modules/http_client/test/recorder_client_test.gleam
@@ -8,9 +8,11 @@ import dream_http_client/storage
 import dream_http_client_test
 import gleam/bit_array
 import gleam/bytes_tree
+import gleam/dynamic/decode
 import gleam/erlang/process
 import gleam/http
 import gleam/io
+import gleam/json
 import gleam/list
 import gleam/option
 import gleam/result
@@ -1209,3 +1211,196 @@ fn collect_chunks_from_mailbox(
     Error(Nil) -> list.reverse(acc)
   }
 }
+
+// ---------------------------------------------------------------------------
+// Regression tests: query parameters must survive through to the HTTP request
+//
+// The mock server's GET /get endpoint echoes the received query string back
+// in a JSON response: {"method":"GET","url":"/get","query":"...","headers":[]}
+// We parse that JSON field for exact assertions rather than substring matching.
+// ---------------------------------------------------------------------------
+
+fn extract_query_from_get_response(body: String) -> String {
+  let decoder = {
+    use query <- decode.field("query", decode.string)
+    decode.success(query)
+  }
+  let assert Ok(query) = json.parse(body, decoder)
+  query
+}
+
+fn stream_chunks_to_string(
+  chunks: List(Result(bytes_tree.BytesTree, String)),
+) -> String {
+  chunks
+  |> list.filter_map(fn(chunk) { chunk })
+  |> list.map(fn(bt) {
+    bt |> bytes_tree.to_bit_array |> bit_array.to_string |> result.unwrap("")
+  })
+  |> string.join("")
+}
+
+// -- send() -----------------------------------------------------------------
+
+pub fn send_includes_query_params_in_request_test() {
+  // Arrange
+  let request =
+    mock_request("/get")
+    |> client.query("page=1&limit=10")
+
+  // Act
+  let assert Ok(client.HttpResponse(body: body, ..)) = client.send(request)
+
+  // Assert - exact match on the echoed query field
+  extract_query_from_get_response(body) |> should.equal("page=1&limit=10")
+}
+
+pub fn send_without_query_params_sends_empty_query_test() {
+  // Arrange
+  let request = mock_request("/get")
+
+  // Act
+  let assert Ok(client.HttpResponse(body: body, ..)) = client.send(request)
+
+  // Assert - query field should be empty when none was set
+  extract_query_from_get_response(body) |> should.equal("")
+}
+
+pub fn send_with_special_characters_in_query_test() {
+  // Arrange - URL-encoded spaces, ampersands, equals signs
+  let request =
+    mock_request("/get")
+    |> client.query("name=hello%20world&tag=a%26b&eq=1%3D1")
+
+  // Act
+  let assert Ok(client.HttpResponse(body: body, ..)) = client.send(request)
+
+  // Assert - query string arrives verbatim (no double-encoding)
+  extract_query_from_get_response(body)
+  |> should.equal("name=hello%20world&tag=a%26b&eq=1%3D1")
+}
+
+pub fn send_with_empty_query_string_test() {
+  // Arrange - explicitly set query to empty string
+  let request =
+    mock_request("/get")
+    |> client.query("")
+
+  // Act
+  let assert Ok(client.HttpResponse(body: body, ..)) = client.send(request)
+
+  // Assert - empty query should still arrive (as empty string, not omitted)
+  extract_query_from_get_response(body) |> should.equal("")
+}
+
+// -- stream_yielder() -------------------------------------------------------
+
+pub fn stream_yielder_includes_query_params_in_request_test() {
+  // Arrange
+  let request =
+    mock_request("/get")
+    |> client.query("format=json")
+
+  // Act
+  let body =
+    client.stream_yielder(request)
+    |> yielder.to_list()
+    |> stream_chunks_to_string()
+
+  // Assert - exact match on the echoed query field
+  extract_query_from_get_response(body) |> should.equal("format=json")
+}
+
+// -- start_stream() (callback-based) ----------------------------------------
+
+pub fn start_stream_includes_query_params_in_request_test() {
+  // Arrange
+  let chunks_subject = process.new_subject()
+
+  let request =
+    mock_request("/get")
+    |> client.query("stream_key=abc")
+    |> client.on_stream_chunk(fn(data) { process.send(chunks_subject, data) })
+
+  // Act
+  let assert Ok(handle) = client.start_stream(request)
+  client.await_stream(handle)
+
+  // Assert - reassemble body from callback chunks and check exact query
+  let body =
+    collect_chunks_from_mailbox(chunks_subject, [])
+    |> list.map(fn(d) { bit_array.to_string(d) |> result.unwrap("") })
+    |> string.join("")
+  extract_query_from_get_response(body) |> should.equal("stream_key=abc")
+}
+
+// -- recorder integration ---------------------------------------------------
+
+pub fn send_with_query_and_recorder_record_mode_preserves_query_test() {
+  // Arrange
+  let recordings_directory_path = temp_directory("query_record_test")
+  let assert Ok(rec) =
+    recorder.new()
+    |> directory(recordings_directory_path)
+    |> mode("record")
+    |> start()
+
+  let request =
+    mock_request("/get")
+    |> client.query("search=hello")
+    |> client.recorder(rec)
+
+  // Act
+  let assert Ok(client.HttpResponse(body: body, ..)) = client.send(request)
+
+  // Assert - query string arrived at the server (exact match)
+  extract_query_from_get_response(body) |> should.equal("search=hello")
+
+  // Flush recordings to disk
+  recorder.stop(rec) |> result.unwrap(Nil)
+
+  // Verify the recording captured the query
+  let assert Ok(recordings) = storage.load_recordings(recordings_directory_path)
+  let assert [first_recording, ..] = recordings
+  first_recording.request.query |> should.equal(option.Some("search=hello"))
+}
+
+pub fn send_with_query_and_recorder_playback_mode_matches_query_test() {
+  // Arrange - record a request with a specific query
+  let recordings_directory_path = temp_directory("query_playback_test")
+  let assert Ok(rec) =
+    recorder.new()
+    |> directory(recordings_directory_path)
+    |> mode("record")
+    |> start()
+
+  let request =
+    mock_request("/get")
+    |> client.query("id=42")
+    |> client.recorder(rec)
+
+  let assert Ok(_) = client.send(request)
+  recorder.stop(rec) |> result.unwrap(Nil)
+
+  // Replay with the same query
+  let assert Ok(playback_rec) =
+    recorder.new()
+    |> directory(recordings_directory_path)
+    |> mode("playback")
+    |> start()
+
+  let playback_request =
+    mock_request("/get")
+    |> client.query("id=42")
+    |> client.recorder(playback_rec)
+
+  // Act
+  let assert Ok(client.HttpResponse(body: body, ..)) =
+    client.send(playback_request)
+
+  // Assert - playback returns the original recorded body (exact match)
+  extract_query_from_get_response(body) |> should.equal("id=42")
+
+  // Cleanup
+  recorder.stop(playback_rec) |> result.unwrap(Nil)
+}
diff --git a/modules/mock_server/CHANGELOG.md b/modules/mock_server/CHANGELOG.md
index 1388752..81f245c 100644
--- a/modules/mock_server/CHANGELOG.md
+++ b/modules/mock_server/CHANGELOG.md
@@ -7,6 +7,16 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+## 1.1.1 - 2026-03-03
+
+### Fixed
+
+- **`GET /get` now actually echoes query parameters.** The endpoint was
+  documented as echoing query parameters since 1.0.0, but the implementation
+  only passed `request.path` to the view layer. Now passes `request.query` as
+  well, and the JSON response includes a `"query"` field with the raw query
+  string.
+
 ## 1.1.0 - 2026-02-15
 
 ### Added
diff --git a/modules/mock_server/README.md b/modules/mock_server/README.md
index 55f3172..d855895 100644
--- a/modules/mock_server/README.md
+++ b/modules/mock_server/README.md
@@ -2,7 +2,7 @@
 
 A general-purpose HTTP mock server developed by Dream that provides both streaming and non-streaming endpoints for testing HTTP clients.
 
-**Current module version:** `1.1.0`
+**Current module version:** `1.1.1`
 
 ## Overview
 
diff --git a/modules/mock_server/gleam.toml b/modules/mock_server/gleam.toml
index aac35a2..37a979d 100644
--- a/modules/mock_server/gleam.toml
+++ b/modules/mock_server/gleam.toml
@@ -1,5 +1,5 @@
 name = "dream_mock_server"
-version = "1.1.0"
+version = "1.1.1"
 description = "General-purpose HTTP mock server developed by Dream - provides both streaming and non-streaming endpoints for testing HTTP clients"
 licences = ["MIT"]
 repository = { type = "github", user = "TrustBound", repo = "dream" }
diff --git a/modules/mock_server/releases/release-1.1.1.md b/modules/mock_server/releases/release-1.1.1.md
new file mode 100644
index 0000000..6543d3c
--- /dev/null
+++ b/modules/mock_server/releases/release-1.1.1.md
@@ -0,0 +1,39 @@
+# Dream Mock Server Release 1.1.1: GET /get now echoes query parameters
+
+**Release Date:** March 3, 2026
+
+This patch release fixes the `GET /get` endpoint to actually echo query
+parameters as documented since 1.0.0.
+
+## What was fixed
+
+The `GET /get` endpoint was listed as "Echo query parameters" in the CHANGELOG
+and endpoint documentation, but the implementation only passed `request.path` to
+the view layer. The query string was silently ignored.
+
+Now the controller passes `request.query` to the view, and the JSON response
+includes a `"query"` field:
+
+```json
+{"method":"GET","url":"/get","query":"page=1&limit=10","headers":[]}
+```
+
+When no query string is present, the field contains an empty string:
+
+```json
+{"method":"GET","url":"/get","query":"","headers":[]}
+```
+
+## Files changed
+
+- `src/dream_mock_server/controllers/api_controller.gleam` — `get()` now passes
+  `request.query` to `api_view.get_to_json`
+- `src/dream_mock_server/views/api_view.gleam` — `get_to_json` and
+  `get_to_json_object` now accept a `query` parameter and include it in the
+  JSON output
+
+## Backward compatibility
+
+The JSON response for `GET /get` now has an additional `"query"` field. Callers
+that parse only `"method"` and `"url"` are unaffected. Callers that do strict
+schema validation may need to accept the new field.
diff --git a/modules/mock_server/src/dream_mock_server/controllers/api_controller.gleam b/modules/mock_server/src/dream_mock_server/controllers/api_controller.gleam
index 9e9786e..035242b 100644
--- a/modules/mock_server/src/dream_mock_server/controllers/api_controller.gleam
+++ b/modules/mock_server/src/dream_mock_server/controllers/api_controller.gleam
@@ -16,13 +16,13 @@ import gleam/list
 import gleam/option
 import gleam/string
 
-/// GET /get - Returns JSON with request info
+/// GET /get - Returns JSON with request info including query parameters
 pub fn get(
   request: Request,
   _context: EmptyContext,
   _services: EmptyServices,
 ) -> Response {
-  json_response(status.ok, api_view.get_to_json(request.path))
+  json_response(status.ok, api_view.get_to_json(request.path, request.query))
 }
 
 /// POST /post - Echoes request body as JSON
diff --git a/modules/mock_server/src/dream_mock_server/views/api_view.gleam b/modules/mock_server/src/dream_mock_server/views/api_view.gleam
index 9c9815f..35f8ac3 100644
--- a/modules/mock_server/src/dream_mock_server/views/api_view.gleam
+++ b/modules/mock_server/src/dream_mock_server/views/api_view.gleam
@@ -6,8 +6,8 @@
 import gleam/json
 
 /// Format GET request info as JSON string
-pub fn get_to_json(path: String) -> String {
-  get_to_json_object(path)
+pub fn get_to_json(path: String, query: String) -> String {
+  get_to_json_object(path, query)
   |> json.to_string()
 }
 
@@ -60,10 +60,11 @@ pub fn error_to_json(message: String) -> String {
 
 // Private helpers - all named functions
 
-fn get_to_json_object(path: String) -> json.Json {
+fn get_to_json_object(path: String, query: String) -> json.Json {
   json.object([
     #("method", json.string("GET")),
     #("url", json.string(path)),
+    #("query", json.string(query)),
     #("headers", json.array(from: [], of: json.string)),
   ])
 }