diff --git a/tests/unit/utils/net/headers.spec.ts b/tests/unit/utils/net/headers.spec.ts
new file mode 100644
index 0000000..1cb546e
--- /dev/null
+++ b/tests/unit/utils/net/headers.spec.ts
@@ -0,0 +1,585 @@
+import { createReadStream, statSync } from "node:fs";
+import mockFs from "mock-fs";
+import { ArrayMap, MultiMap } from "@/utils/collections/map";
+import { Blob } from "@/utils/net/blob";
+import { appendHeader, appendHeaders, cloneHeaders, deleteHeader, deleteHeaders, getHeader, hasHeader, inferHttpRequestBodyHeaders, setDefaultHeader, setDefaultHeaders, setHeader, setHeaders } from "@/utils/net";
+
+beforeEach(() => {
+    mockFs({
+        "file.json": "{}",
+    });
+});
+
+afterEach(() => {
+    mockFs.restore();
+});
+
+describe("hasHeader", () => {
+    test("returns true when header exists in a Record", () => {
+        const headers = { "Content-Type": "application/json" };
+
+        expect(hasHeader(headers, "Content-Type")).toBe(true);
+    });
+
+    test("returns false when header does not exist in a Record", () => {
+        const headers = { "Content-Type": "application/json" };
+
+        expect(hasHeader(headers, "Authorization")).toBe(false);
+    });
+
+    test("returns true when header exists in an Iterable", () => {
+        const headers = [["Content-Type", "application/json"]];
+
+        expect(hasHeader(headers, "Content-Type")).toBe(true);
+    });
+
+    test("returns false when header does not exist in an Iterable", () => {
+        const headers = [["Content-Type", "application/json"]];
+
+        expect(hasHeader(headers, "Authorization")).toBe(false);
+    });
+
+    test("returns true when header exists in a Map", () => {
+        const headers = new Map([["Content-Type", "application/json"]]);
+
+        expect(hasHeader(headers, "Content-Type")).toBe(true);
+    });
+
+    test("returns false when header does not exist in a Map", () => {
+        const headers = new Map([["Content-Type", "application/json"]]);
+
+        expect(hasHeader(headers, "Authorization")).toBe(false);
+    });
+
+    test("is case-sensitive by default", () => {
+        const headers = { "Content-Type": "application/json" };
+
+        expect(hasHeader(headers, "content-type")).toBe(false);
+    });
+
+    test("uses a custom comparer provided by the Map instance", () => {
+        const headers = new ArrayMap([["Content-Type", "application/json"]], (a, b) => a.toLowerCase() === b.toLowerCase());
+
+        expect(hasHeader(headers, "content-type")).toBe(true);
+    });
+});
+
+describe("getHeader", () => {
+    test("returns undefined when headers are not present", () => {
+        expect(getHeader(null, "Content-Type")).toBeUndefined();
+        expect(getHeader(undefined, "Content-Type")).toBeUndefined();
+    });
+
+    test("returns the value of the header when headers are stored in a Record", () => {
+        const headers = { "Content-Type": "application/json" };
+
+        expect(getHeader(headers, "Content-Type")).toBe("application/json");
+    });
+
+    test("returns undefined when the header does not exist in a Record", () => {
+        const headers = { "Content-Type": "application/json" };
+
+        expect(getHeader(headers, "Authorization")).toBeUndefined();
+    });
+
+    test("returns the value of the header when headers are stored in an Iterable", () => {
+        const headers = [["Content-Type", "application/json"]];
+
+        expect(getHeader(headers, "Content-Type")).toBe("application/json");
+    });
+
+    test("returns undefined when the header does not exist in an Iterable", () => {
+        const headers = [["Content-Type", "application/json"]];
+
+        expect(getHeader(headers, "Authorization")).toBeUndefined();
+    });
+
+    test("returns the value of the header when headers are stored in a Map", () => {
+        const headers = new Map([["Content-Type", "application/json"]]);
+
+        expect(getHeader(headers, "Content-Type")).toBe("application/json");
+    });
+
+    test("returns undefined when the header does not exist in a Map", () => {
+        const headers = new Map([["Content-Type", "application/json"]]);
+
+        expect(getHeader(headers, "Authorization")).toBeUndefined();
+    });
+
+    test("returns the value of the header when headers are stored in a MultiMap", () => {
+        const headers = new MultiMap([["Content-Type", ["application/json", "charset=utf-8"]]]) as unknown as Map<string, string>;
+
+        expect(getHeader(headers, "Content-Type")).toBe("application/json, charset=utf-8");
+    });
+
+    test("returns undefined when the header does not exist in a MultiMap", () => {
+        const headers = new MultiMap([["Content-Type", ["application/json"]]]) as unknown as Map<string, string>;
+
+        expect(getHeader(headers, "Authorization")).toBeUndefined();
+    });
+});
+
+describe("appendHeader", () => {
+    test("appends a header value when headers are stored in a Record", () => {
+        const headers = { "Content-Type": "application/json" };
+
+        const updatedHeaders = appendHeader(headers, "Content-Type", "charset=utf-8");
+
+        expect(getHeader(updatedHeaders, "Content-Type")).toBe("application/json, charset=utf-8");
+    });
+
+    test("appends a header value when headers are stored in an Iterable", () => {
+        const headers = [["Content-Type", "application/json"]];
+
+        const updatedHeaders = appendHeader(headers, "Content-Type", "charset=utf-8");
+
+        expect(getHeader(updatedHeaders, "Content-Type")).toBe("application/json, charset=utf-8");
+    });
+
+    test("appends a header value when headers are stored in a Map", () => {
+        const headers = new Map([["Content-Type", "application/json"]]);
+
+        const updatedHeaders = appendHeader(headers, "Content-Type", "charset=utf-8");
+
+        expect(getHeader(updatedHeaders, "Content-Type")).toBe("application/json, charset=utf-8");
+    });
+
+    test("appends a header value when headers are stored in a MultiMap", () => {
+        const headers = new MultiMap([["Content-Type", ["application/json"]]]) as unknown as Map<string, string>;
+
+        appendHeader(headers, "Content-Type", "charset=utf-8");
+
+        expect(getHeader(headers, "Content-Type")).toBe("application/json, charset=utf-8");
+    });
+
+    test("creates a new header when the header does not exist", () => {
+        const headers = { };
+
+        const updatedHeaders = appendHeader(headers, "Content-Type", "application/json");
+
+        expect(getHeader(updatedHeaders, "Content-Type")).toBe("application/json");
+    });
+});
+
+describe("appendHeaders", () => {
+    test("appends multiple headers when headers are stored in a Record", () => {
+        const headers = { "Content-Type": "application/json" };
+        const newHeaders = { Authorization: "Bearer token" };
+
+        const updatedHeaders = appendHeaders(headers, newHeaders);
+
+        expect(getHeader(updatedHeaders, "Content-Type")).toBe("application/json");
+        expect(getHeader(updatedHeaders, "Authorization")).toBe("Bearer token");
+    });
+
+    test("appends multiple headers when headers are stored in an Iterable", () => {
+        const headers = [["Content-Type", "application/json"]];
+        const newHeaders = [["Authorization", "Bearer token"]];
+
+        const updatedHeaders = appendHeaders(headers, newHeaders);
+
+        expect(getHeader(updatedHeaders, "Content-Type")).toBe("application/json");
+        expect(getHeader(updatedHeaders, "Authorization")).toBe("Bearer token");
+    });
+
+    test("appends multiple headers when headers are stored in a Map", () => {
+        const headers = new Map([["Content-Type", "application/json"]]);
+        const newHeaders = new Map([["Authorization", "Bearer token"]]);
+
+        const updatedHeaders = appendHeaders(headers, newHeaders);
+
+        expect(getHeader(updatedHeaders, "Content-Type")).toBe("application/json");
+        expect(getHeader(updatedHeaders, "Authorization")).toBe("Bearer token");
+    });
+
+    test("appends multiple headers when headers are stored in a MultiMap", () => {
+        const headers = new MultiMap([["Content-Type", ["application/json"]]]) as unknown as Map<string, string>;
+        const newHeaders = new MultiMap([["Authorization", ["Bearer token"]]]) as unknown as Map<string, string>;
+
+        const updatedHeaders = appendHeaders(headers, newHeaders);
+
+        expect(getHeader(updatedHeaders, "Content-Type")).toBe("application/json");
+        expect(getHeader(updatedHeaders, "Authorization")).toBe("Bearer token");
+    });
+});
+
+describe("setHeader", () => {
+    test("sets a header value when headers are stored in a Record", () => {
+        const headers = { "Content-Type": "application/json" };
+
+        const updatedHeaders = setHeader(headers, "Content-Type", "text/plain");
+
+        expect(getHeader(updatedHeaders, "Content-Type")).toBe("text/plain");
+    });
+
+    test("sets a header value when headers are stored in an Iterable", () => {
+        const headers = [["Content-Type", "application/json"]];
+
+        const updatedHeaders = setHeader(headers, "Content-Type", "text/plain");
+
+        expect(getHeader(updatedHeaders, "Content-Type")).toBe("text/plain");
+    });
+
+    test("sets a header value when headers are stored in a Map", () => {
+        const headers = new Map([["Content-Type", "application/json"]]);
+
+        const updatedHeaders = setHeader(headers, "Content-Type", "text/plain");
+
+        expect(getHeader(updatedHeaders, "Content-Type")).toBe("text/plain");
+    });
+
+    test("sets a header value when headers are stored in a MultiMap", () => {
+        const headers = new MultiMap([["Content-Type", ["application/json"]]]) as unknown as Map<string, string>;
+
+        const updatedHeaders = setHeader(headers, "Content-Type", "text/plain");
+
+        expect(getHeader(updatedHeaders, "Content-Type")).toBe("text/plain");
+    });
+
+    test("deletes a header when the value is null or undefined", () => {
+        const headers = { "Content-Type": "application/json", "Authorization": "Bearer token" };
+
+        const updatedHeaders = setHeader(setHeader(headers, "Content-Type", null), "Authorization", undefined);
+
+        expect(hasHeader(updatedHeaders, "Content-Type")).toBe(false);
+        expect(hasHeader(updatedHeaders, "Authorization")).toBe(false);
+    });
+});
+
+describe("setHeaders", () => {
+    test("sets multiple headers when headers are stored in a Record", () => {
+        const headers = { "Content-Type": "application/json" };
+        const newHeaders = { "Authorization": "Bearer token", "Content-Type": "text/plain" };
+
+        const updatedHeaders = setHeaders(headers, newHeaders);
+
+        expect(getHeader(updatedHeaders, "Content-Type")).toBe("text/plain");
+        expect(getHeader(updatedHeaders, "Authorization")).toBe("Bearer token");
+    });
+
+    test("sets multiple headers when headers are stored in an Iterable", () => {
+        const headers = [["Content-Type", "application/json"]];
+        const newHeaders = [["Authorization", "Bearer token"], ["Content-Type", "text/plain"]];
+
+        const updatedHeaders = setHeaders(headers, newHeaders);
+
+        expect(getHeader(updatedHeaders, "Content-Type")).toBe("text/plain");
+        expect(getHeader(updatedHeaders, "Authorization")).toBe("Bearer token");
+    });
+
+    test("sets multiple headers when headers are stored in a Map", () => {
+        const headers = new Map([["Content-Type", "application/json"]]);
+        const newHeaders = new Map([["Authorization", "Bearer token"], ["Content-Type", "text/plain"]]);
+
+        const updatedHeaders = setHeaders(headers, newHeaders);
+
+        expect(getHeader(updatedHeaders, "Content-Type")).toBe("text/plain");
+        expect(getHeader(updatedHeaders, "Authorization")).toBe("Bearer token");
+    });
+
+    test("sets multiple headers when headers are stored in a MultiMap", () => {
+        const headers = new MultiMap([["Content-Type", ["application/json"]]]) as unknown as Map<string, string>;
+        const newHeaders = new MultiMap([["Authorization", ["Bearer token"]], ["Content-Type", ["text/plain"]]]) as unknown as Map<string, string>;
+
+        const updatedHeaders = setHeaders(headers, newHeaders);
+
+        expect(getHeader(updatedHeaders, "Content-Type")).toBe("text/plain");
+        expect(getHeader(updatedHeaders, "Authorization")).toBe("Bearer token");
+    });
+
+    test("deletes multiple headers when a new value is null or undefined", () => {
+        const headers = { "Content-Type": "application/json", "Authorization": "Bearer token" };
+        const newHeaders = { "Content-Type": null, "Authorization": undefined };
+
+        const updatedHeaders = setHeaders(headers, newHeaders);
+
+        expect(hasHeader(updatedHeaders, "Content-Type")).toBe(false);
+        expect(hasHeader(updatedHeaders, "Authorization")).toBe(false);
+    });
+});
+
+describe("setDefaultHeader", () => {
+    test("does not set the header value when the header already exists in a Record", () => {
+        const headers = { "Content-Type": "application/json" };
+
+        const updatedHeaders = setDefaultHeader(headers, "Content-Type", "text/plain");
+
+        expect(getHeader(updatedHeaders, "Content-Type")).toBe("application/json");
+    });
+
+    test("sets the header value when the header does not exist in a Record", () => {
+        const headers = { "Content-Type": "application/json" };
+
+        const updatedHeaders = setDefaultHeader(headers, "Authorization", "Bearer token");
+
+        expect(getHeader(updatedHeaders, "Authorization")).toBe("Bearer token");
+    });
+
+    test("does not set the header value when the header already exists in an Iterable", () => {
+        const headers = [["Content-Type", "application/json"]];
+
+        const updatedHeaders = setDefaultHeader(headers, "Content-Type", "text/plain");
+
+        expect(getHeader(updatedHeaders, "Content-Type")).toBe("application/json");
+    });
+
+    test("sets the header value when the header does not exist in an Iterable", () => {
+        const headers = [["Content-Type", "application/json"]];
+
+        const updatedHeaders = setDefaultHeader(headers, "Authorization", "Bearer token");
+
+        expect(getHeader(updatedHeaders, "Authorization")).toBe("Bearer token");
+    });
+
+    test("does not set the header value when the header already exists in a Map", () => {
+        const headers = new Map([["Content-Type", "application/json"]]);
+
+        const updatedHeaders = setDefaultHeader(headers, "Content-Type", "text/plain");
+
+        expect(getHeader(updatedHeaders, "Content-Type")).toBe("application/json");
+    });
+
+    test("sets the header value when the header does not exist in a Map", () => {
+        const headers = new Map([["Content-Type", "application/json"]]);
+
+        const updatedHeaders = setDefaultHeader(headers, "Authorization", "Bearer token");
+
+        expect(getHeader(updatedHeaders, "Authorization")).toBe("Bearer token");
+    });
+});
+
+describe("setDefaultHeaders", () => {
+    test("does not set the header values when the headers already exist in a Record", () => {
+        const headers = { "Content-Type": "application/json", "Authorization": "Bearer token" };
+        const defaultHeaders = { "Content-Type": "text/plain", "Authorization": "Basic auth" };
+
+        const updatedHeaders = setDefaultHeaders(headers, defaultHeaders);
+
+        expect(getHeader(updatedHeaders, "Content-Type")).toBe("application/json");
+        expect(getHeader(updatedHeaders, "Authorization")).toBe("Bearer token");
+    });
+
+    test("sets the header values when the headers do not exist in a Record", () => {
+        const headers = { "Content-Type": "application/json" };
+        const defaultHeaders = { Authorization: "Bearer token" };
+
+        const updatedHeaders = setDefaultHeaders(headers, defaultHeaders);
+
+        expect(getHeader(updatedHeaders, "Content-Type")).toBe("application/json");
+        expect(getHeader(updatedHeaders, "Authorization")).toBe("Bearer token");
+    });
+
+    test("does not set the header values when the headers already exist in an Iterable", () => {
+        const headers = [["Content-Type", "application/json"], ["Authorization", "Bearer token"]];
+        const defaultHeaders = [["Content-Type", "text/plain"], ["Authorization", "Basic auth"]];
+
+        const updatedHeaders = setDefaultHeaders(headers, defaultHeaders);
+
+        expect(getHeader(updatedHeaders, "Content-Type")).toBe("application/json");
+        expect(getHeader(updatedHeaders, "Authorization")).toBe("Bearer token");
+    });
+
+    test("sets the header values when the headers do not exist in an Iterable", () => {
+        const headers = [["Content-Type", "application/json"]];
+        const defaultHeaders = [["Authorization", "Bearer token"]];
+
+        const updatedHeaders = setDefaultHeaders(headers, defaultHeaders);
+
+        expect(getHeader(updatedHeaders, "Content-Type")).toBe("application/json");
+        expect(getHeader(updatedHeaders, "Authorization")).toBe("Bearer token");
+    });
+
+    test("does not set the header values when the headers already exist in a Map", () => {
+        const headers = new Map([["Content-Type", "application/json"], ["Authorization", "Bearer token"]]);
+        const defaultHeaders = new Map([["Content-Type", "text/plain"], ["Authorization", "Basic auth"]]);
+
+        const updatedHeaders = setDefaultHeaders(headers, defaultHeaders);
+
+        expect(getHeader(updatedHeaders, "Content-Type")).toBe("application/json");
+        expect(getHeader(updatedHeaders, "Authorization")).toBe("Bearer token");
+    });
+
+    test("sets the header values when the headers do not exist in a Map", () => {
+        const headers = new Map([["Content-Type", "application/json"]]);
+        const defaultHeaders = new Map([["Authorization", "Bearer token"]]);
+
+        const updatedHeaders = setDefaultHeaders(headers, defaultHeaders);
+
+        expect(getHeader(updatedHeaders, "Content-Type")).toBe("application/json");
+        expect(getHeader(updatedHeaders, "Authorization")).toBe("Bearer token");
+    });
+});
+
+describe("deleteHeader", () => {
+    test("deletes the header when headers are stored in a Record", () => {
+        const headers = { "Content-Type": "application/json" };
+
+        const updatedHeaders = deleteHeader(headers, "Content-Type");
+
+        expect(hasHeader(updatedHeaders, "Content-Type")).toBe(false);
+    });
+
+    test("does not delete other headers when headers are stored in a Record", () => {
+        const headers = { "Content-Type": "application/json", "Authorization": "Bearer token" };
+
+        const updatedHeaders = deleteHeader(headers, "Content-Type");
+
+        expect(hasHeader(updatedHeaders, "Authorization")).toBe(true);
+    });
+
+    test("deletes the header when headers are stored in an Iterable", () => {
+        const headers = [["Content-Type", "application/json"]];
+
+        const updatedHeaders = deleteHeader(headers, "Content-Type");
+
+        expect(hasHeader(updatedHeaders, "Content-Type")).toBe(false);
+    });
+
+    test("does not delete other headers when headers are stored in an Iterable", () => {
+        const headers = [["Content-Type", "application/json"], ["Authorization", "Bearer token"]];
+
+        const updatedHeaders = deleteHeader(headers, "Content-Type");
+
+        expect(hasHeader(updatedHeaders, "Authorization")).toBe(true);
+    });
+
+    test("deletes the header when headers are stored in a Map", () => {
+        const headers = new Map([["Content-Type", "application/json"]]);
+
+        const updatedHeaders = deleteHeader(headers, "Content-Type");
+
+        expect(hasHeader(updatedHeaders, "Content-Type")).toBe(false);
+    });
+
+    test("does not delete other headers when headers are stored in a Map", () => {
+        const headers = new Map([["Content-Type", "application/json"], ["Authorization", "Bearer token"]]);
+
+        const updatedHeaders = deleteHeader(headers, "Content-Type");
+
+        expect(hasHeader(updatedHeaders, "Authorization")).toBe(true);
+    });
+});
+
+describe("deleteHeaders", () => {
+    test("deletes multiple headers when headers are stored in a Record", () => {
+        const headers = { "Content-Type": "application/json", "Authorization": "Bearer token" };
+
+        const updatedHeaders = deleteHeaders(headers, ["Content-Type", "Authorization"]);
+
+        expect(hasHeader(updatedHeaders, "Content-Type")).toBe(false);
+        expect(hasHeader(updatedHeaders, "Authorization")).toBe(false);
+    });
+
+    test("does not delete other headers when headers are stored in a Record", () => {
+        const headers = { "Content-Type": "application/json", "Authorization": "Bearer token", "Accept": "application/json" };
+
+        const updatedHeaders = deleteHeaders(headers, ["Content-Type", "Authorization"]);
+
+        expect(hasHeader(updatedHeaders, "Accept")).toBe(true);
+    });
+
+    test("deletes multiple headers when headers are stored in an Iterable", () => {
+        const headers = [["Content-Type", "application/json"], ["Authorization", "Bearer token"]];
+
+        const updatedHeaders = deleteHeaders(headers, ["Content-Type", "Authorization"]);
+
+        expect(hasHeader(updatedHeaders, "Content-Type")).toBe(false);
+        expect(hasHeader(updatedHeaders, "Authorization")).toBe(false);
+    });
+
+    test("does not delete other headers when headers are stored in an Iterable", () => {
+        const headers = [["Content-Type", "application/json"], ["Authorization", "Bearer token"], ["Accept", "application/json"]];
+
+        const updatedHeaders = deleteHeaders(headers, ["Content-Type", "Authorization"]);
+
+        expect(hasHeader(updatedHeaders, "Accept")).toBe(true);
+    });
+
+    test("deletes multiple headers when headers are stored in a Map", () => {
+        const headers = new Map([["Content-Type", "application/json"], ["Authorization", "Bearer token"]]);
+
+        const updatedHeaders = deleteHeaders(headers, ["Content-Type", "Authorization"]);
+
+        expect(hasHeader(updatedHeaders, "Content-Type")).toBe(false);
+        expect(hasHeader(updatedHeaders, "Authorization")).toBe(false);
+    });
+
+    test("does not delete other headers when headers are stored in a Map", () => {
+        const headers = new Map([["Content-Type", "application/json"], ["Authorization", "Bearer token"], ["Accept", "application/json"]]);
+
+        const updatedHeaders = deleteHeaders(headers, ["Content-Type", "Authorization"]);
+
+        expect(hasHeader(updatedHeaders, "Accept")).toBe(true);
+    });
+});
+
+describe("cloneHeaders", () => {
+    test("returns undefined when headers are not present", () => {
+        expect(cloneHeaders(null)).toBeUndefined();
+        expect(cloneHeaders(undefined)).toBeUndefined();
+    });
+
+    test("clones the headers when headers are stored in a Record", () => {
+        const headers = { "Content-Type": "application/json" };
+
+        const clonedHeaders = cloneHeaders(headers);
+
+        expect(clonedHeaders).not.toBe(headers);
+        expect(clonedHeaders).toEqual(headers);
+    });
+
+    test("clones the headers when headers are stored in an Iterable", () => {
+        const headers = [["Content-Type", "application/json"]];
+
+        const clonedHeaders = cloneHeaders(headers);
+
+        expect(clonedHeaders).not.toBe(headers);
+        expect(clonedHeaders).toEqual(headers);
+    });
+
+    test("clones the headers when headers are stored in a Map", () => {
+        const headers = new Map([["Content-Type", "application/json"]]);
+
+        const clonedHeaders = cloneHeaders(headers);
+
+        expect(clonedHeaders).not.toBe(headers);
+        expect(clonedHeaders).toEqual(headers);
+    });
+});
+
+describe("inferHttpRequestBodyHeaders", () => {
+    test("returns empty headers when body is not streamable", () => {
+        const body = "non-streamable body";
+
+        const headers = inferHttpRequestBodyHeaders(body);
+
+        expect(headers).toEqual({});
+    });
+
+    test("returns correct headers when body is a Blob", () => {
+        const body = new Blob(["blob content"]);
+
+        const headers = inferHttpRequestBodyHeaders(body);
+
+        expect(headers["Content-Type"]).toBe("application/octet-stream");
+        expect(headers["Content-Length"]).toBe(String(body.size));
+    });
+
+    test("returns correct headers when body is a Buffer", () => {
+        const body = Buffer.from("buffer content");
+
+        const headers = inferHttpRequestBodyHeaders(body);
+
+        expect(headers["Content-Type"]).toBe("application/octet-stream");
+        expect(headers["Content-Length"]).toBe(String(body.byteLength));
+    });
+
+    test("returns correct headers when body is a ReadableStream created from a file path", () => {
+        const body = createReadStream("file.json");
+
+        const headers = inferHttpRequestBodyHeaders(body);
+
+        expect(headers["Content-Type"]).toBe("application/octet-stream");
+        expect(headers["Content-Length"]).toBe(String(statSync("file.json").size));
+    });
+});