Open the boundaries of HTTP and state.

{
  "representation": "HTTP/1.1 teaching text, CRLF-delimited; selected headers only",
  "storageTransport": "in-process-call, seeded memory",
  "exchanges": [
    {
      "case": "found",
      "requestId": "demo-book-found",
      "request": "GET /api/book?case=found HTTP/1.1\r\nHost: 127.0.0.1:4175\r\nAccept: application/json\r\n\r\n",
      "response": "HTTP/1.1 200 OK\r\nContent-Type: application/json\r\nContent-Length: 53\r\nCache-Control: no-store\r\nX-Lab-Request-Id: demo-book-found\r\n\r\n{\"book\":{\"id\":\"book-atlas\",\"title\":\"Atlas Notları\"}}",
      "bodyUtf8Bytes": 53,
      "trace": [
        {
          "seq": 1,
          "actor": "handler",
          "event": "request-received",
          "requestId": "demo-book-found"
        },
        {
          "seq": 2,
          "actor": "handler",
          "event": "route-selected",
          "route": "/api/book"
        },
        {
          "seq": 3,
          "actor": "storage-adapter",
          "event": "local-lookup",
          "transport": "in-process-call"
        },
        {
          "seq": 4,
          "actor": "storage-adapter",
          "event": "record-found"
        },
        {
          "seq": 5,
          "actor": "handler",
          "event": "response-created",
          "status": 200
        }
      ],
      "browserExpected": {
        "fetch": "fulfilled-with-Response",
        "status": 200,
        "ok": true,
        "body": "await response.json()",
        "view": "book-title"
      }
    },
    {
      "case": "missing",
      "requestId": "demo-book-missing",
      "request": "GET /api/book?case=missing HTTP/1.1\r\nHost: 127.0.0.1:4175\r\nAccept: application/json\r\n\r\n",
      "response": "HTTP/1.1 404 Not Found\r\nContent-Type: application/json\r\nContent-Length: 26\r\nCache-Control: no-store\r\nX-Lab-Request-Id: demo-book-missing\r\n\r\n{\"error\":\"BOOK_NOT_FOUND\"}",
      "bodyUtf8Bytes": 26,
      "trace": [
        {
          "seq": 1,
          "actor": "handler",
          "event": "request-received",
          "requestId": "demo-book-missing"
        },
        {
          "seq": 2,
          "actor": "handler",
          "event": "route-selected",
          "route": "/api/book"
        },
        {
          "seq": 3,
          "actor": "storage-adapter",
          "event": "local-lookup",
          "transport": "in-process-call"
        },
        {
          "seq": 4,
          "actor": "storage-adapter",
          "event": "record-missing"
        },
        {
          "seq": 5,
          "actor": "handler",
          "event": "response-created",
          "status": 404
        }
      ],
      "browserExpected": {
        "fetch": "fulfilled-with-Response",
        "status": 404,
        "ok": false,
        "body": "await response.json()",
        "view": "not-found-message"
      }
    }
  ]
}

request / response

HTTP/1.1 teaching representation, not raw DevTools capture; an empty CRLF line separates headers and body.

Content-Length / bodyUtf8Bytes

Body octets without compression, potentially different from Unicode character count.

X-Lab-Request-Id / requestId

Custom example correlation field, not an HTTP standard.

trace[].actor / event / transport

Server processing and local adapter calls, not network protocol records.

browserExpected

Distinct expected outcomes for HTTP Response, body reading and view.

Synthetic selected-header representation, not a complete RFC-compliant server transcript or claimed lab output. Date and other browser headers are omitted. HTTP/2–3 framing, packetization, DNS/TLS and real persistence are not modeled. If the real lab uses another correlation header, its implementation contract governs.

URL · path, query and fragment

https://books.example:8443/catalog/atlas?lang=tr&tag=network&tag=web#summary

host

Host includes the explicit port: books.example:8443. Hostname remains books.example.

origin

An HTTP(S) origin is formed from scheme, hostname and effective port; path or query does not change this boundary.

tag

The query contains the tag name twice. Both fields are preserved; a single get result does not represent all values.

hash

The #summary fragment is present in the URL; it is not appended to the HTTP request target.

httpOriginForm

Path and query are shown together. Compare this value with the fragment, which is absent here.

Synthetic teaching text. Parsing shows URL fields or cookie pairs; it does not produce browser policy, storage or server session results.

Cookie · pairs sent in a request

hd_language=tr; hd_view=compact

hd_language

A sent language preference. This name/value pair is neither an identity nor a book access permission.

hd_view

A second preference pair. Request Cookie text does not carry Path, HttpOnly or SameSite attributes back.

Synthetic teaching text. Parsing shows URL fields or cookie pairs; it does not produce browser policy, storage or server session results.

Set-Cookie · preference and scope in a response

hd_language=tr; Path=/

hd_language

The response proposes a language preference. Reading the text does not prove the browser accepted and stored it.

Path

A scope attribute for request path matching. It is absent from request Cookie pairs and does not provide security isolation.

Synthetic teaching text. Parsing shows URL fields or cookie pairs; it does not produce browser policy, storage or server session results.