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11.11 最強折扣反應熱烈!
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11.11 最強折扣反應熱烈!
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什麼是超文本傳輸協定 (HTTP)?

HTTP 是一種用於通過 Internet 傳輸數據的協定。它是 Web 上任何數據交換的基礎,並允許檢索 HTML 頁面、圖像、視頻和其他資源。HTTP 在用戶端-伺服器模型上運行,其中用戶端向伺服器發送請求,伺服器使用請求的數據進行回應。

HTTP 是如何工作的?

當您在 Web 瀏覽器中鍵入統一資源定位符 (URL) 並按 Enter 鍵時,您的瀏覽器會向託管網站的伺服器發送 HTTP 請求。該請求由方法(如 GET 或 POST)、資源的 URL 和可選標頭組成。伺服器處理請求併發回 HTTP 回應,其中包括指示請求成功或失敗的狀態代碼,以及請求的數據或錯誤消息。

常見的 HTTP 方法有哪些?

有幾種 HTTP 方法,但最常用的是: GET:從伺服器檢索數據。 POST:向伺服器發送數據以創建新資源。 PUT:更新伺服器上的現有資源。 DELETE:從伺服器中刪除資源。 HEAD:僅檢索回應的標頭,而不檢索實際數據。 PATCH:部分更新現有資源。

HTTP與超文本傳輸協定安全(HTTPS)有何不同?

HTTP 和 HTTPS 都遵循相同的基本原則,但 HTTPS 增加了額外的安全層。HTTPS中的“S”代表安全,它使用加密來確保客戶端和伺服器之間傳輸的數據不會被惡意行為者攔截或篡改。HTTPS通常用於敏感交易,例如網上銀行或電子商務。

什麼是 HTTP 標頭?

HTTP 標頭是與 HTTP 請求或回應一起發送的附加資訊。它們提供有關請求或回應的重要元數據,並説明客戶端和伺服器瞭解如何處理數據。標頭可以包含內容類型、緩存控制指令、Cookie 等資訊。

HTTP可以用於即時通信嗎?

雖然 HTTP 最初不是為即時通信而設計的,但它可以用於某些類型的即時應用程式。例如,長輪詢或伺服器發送事件等技術可以類比通過 HTTP 進行的即時通信。然而,對於要求更高的即時應用程式,WebSockets 等其他協定通常是首選,因為它們具有較低的延遲和雙向功能。

什麼是HTTP中的緩存?

HTTP 中的快取是指在用戶端(瀏覽器或代理伺服器)上存儲網頁或資源副本的過程,通過提供緩存的內容而不是向伺服器發出新請求來減少頻寬使用並提高性能。

緩存在 HTTP 中是如何工作的?

HTTP 中的快取允許在客戶端或中間伺服器上臨時存儲資源。當用戶端發出資源請求時,伺服器可以在響應標頭中包含緩存指令。下次請求同一資源時,用戶端可以使用緩存的版本,而不是向伺服器發出新請求。這樣可以減少網路流量並提高性能。

我可以使用HTTP傳輸檔嗎?

是的,HTTP 可用於傳輸檔,但它不是大型文件傳輸的最有效方法。雖然使用 HTTP 可以輕鬆傳輸小檔,但大檔可能會導致傳送速率變慢和潛在的超時。為了實現高效的檔傳輸,通常使用檔案傳輸協定 (FTP) 等協定或安全複製協定 (SCP) 或 SSH 檔案傳輸協定 (SFTP) 等專用檔傳輸協定。

HTTP 請求和回應可以攜帶 HTML 以外的數據嗎?

是的,HTTP 請求和回應可以攜帶除 HTML 以外的各種類型的數據。HTTP 是一種靈活的協定,可以傳輸各種內容類型,包括圖像、視頻、JSON、XML、純文本等。正在傳輸的數據的內容類型在「Content-Type」標頭中指定,允許客戶端和伺服器正確通信和解釋數據。

什麼是 HTTP 上下文中的 cookie?

Cookie 是由 Web 瀏覽器儲存在用戶端的一小段數據。網站使用它們來存儲有關使用者瀏覽活動或偏好的資訊。當 HTTP 回應包含“Set-Cookie”標頭時,瀏覽器會保存cookie並將其與後續請求一起發送回同一網站。Cookie 支援個人化體驗、會話管理和跟蹤用戶行為。

HTTP 是否支援身份驗證?

是的,HTTP 支援通過使用標頭的身份驗證機制。最常見的方法是 HTTP 基本身份驗證,其中用戶端在請求中包含一個“ Authorization「標頭,其中包含以 Base64 編碼的使用者名和密碼。但是,HTTP 基本身份驗證對於傳輸敏感資訊並不安全,因此其他方法(如 OAuth 或基於令牌的身份驗證)通常用於現代 Web 應用程式。

HTTP 可以用於即時流式傳輸嗎?

由於 HTTP 的請求-回應性質,HTTP 最初不是為即時流式處理而設計的。但是,已經開發了 HTTP 即時流式處理 (HLS) 和基於 HTTP 的動態自適應流式處理 (DASH) 等技術,以實現通過 HTTP 進行影片流式處理。這些協定將視頻內容分割成小塊,這些小塊可以通過常規 HTTP 請求傳遞,從而實現更流暢的流媒體體驗。

狀態碼在HTTP中的作用是什麼?

狀態代碼是伺服器作為 HTTP 回應的一部分發送的三位數數位。它們指示請求的結果,並幫助客戶瞭解如何處理回應。一些常見的狀態代碼包括: 200 OK:請求成功。 404 未找到:找不到請求的資源。 500 內部伺服器錯誤:伺服器上發生意外錯誤。 狀態代碼對於故障排除、錯誤處理以及客戶端和伺服器之間的通信至關重要。

統一資源定位符(URL)在HTTP中的作用是什麼?

URL 用作標識資源在 Web 上的位置的位址。在 HTTP 請求中,URL 指定用戶端要檢索或與之交互的特定資源。它由多個元件組成,例如協定 (http://)、功能變數名稱、路徑、查詢參數和片段標識符。URL 在確定 HTTP 請求的目標方面起著至關重要的作用。

HTTP 如何處理重定向?

HTTP 支持通過以“3”開頭的狀態代碼(例如 301、302)進行重定向。當伺服器發送重定向回應時,它包含一個「位置」標頭,其中包含用戶端應重定向到的統一資源定位符 (URL)。然後,客戶端的瀏覽器會自動向提供的 URL 發出新請求。當資源已移動或網站想要將使用者定向到其他頁面時,通常使用重定向。

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