enctype ='multipart / form-data'是什么意思？ [英] What does enctype='multipart/form-data' mean?

问题描述

enctype ='multipart / form-data'在 HTML 表单中的含义是什么，我们应该在什么时候使用当你发出一个POST请求时，你必须以某种方式对形成请求主体的数据进行编码。 。

HTML表单提供了三种编码方法。

• application / x-www-form-urlencoded （默认） li>
  
• multipart / form-data


• text / plain
  
  

  正在完成添加 application / json ，但已被放弃。

  
  
  

  这些格式的细节对大多数开发人员无关紧要。重要的是：
  
  

  在编写客户端代码时，您只需使用 multipart / form-data 当您的表单包含任何< input type =file> 元素。

  
  
  

  在编写服务器端代码时：使用预先写好的表单处理库（例如Perl的 CGI-> param 或由PHP的 $ _ POST superglobal）公开的那个，它会照顾到你的差异。不要试图解析服务器接收到的原始输入。

  
  
  

  切勿使用 text / plain 。
  
  

  ---

  
  
  

  如果您正在编写（或调试）库来解析或生成原始数据，那么你需要开始担心格式。您可能也想知道它的利益。

  
  
  

  application / x-www-form-urlencoded 是或多或少与URL末尾的查询字符串相同。
  
  

  multipart / form-data 显着更复杂，但它允许将整个文件包含在数据中。结果的一个例子可以在 HTML 4规范中找到。
  
  

  text / plain 由HTML 5引入，仅用于调试 - 规范：它们不能被计算机可靠解释 em> - 我认为其他人与工具结合在一起（比如大多数浏览器的开发人员工具中的Net选项卡）会更好。）

  
  

  What does enctype='multipart/form-data' mean in an HTML form and when should we use it?

  解决方案

  When you make a POST request, you have to encode the data that forms the body of the request in some way.

  HTML forms provide three methods of encoding.

  • application/x-www-form-urlencoded (the default)
  • multipart/form-data
  • text/plain

  Work was being done on adding application/json, but that has been abandoned.

  The specifics of the formats don't matter to most developers. The important points are:

  When you are writing client-side code, all you need to know is use multipart/form-data when your form includes any <input type="file"> elements.

  When you are writing server-side code: Use a prewritten form handling library (e.g. Perl's CGI->param or the one exposed by PHP's $_POST superglobal) and it will take care of the differences for you. Don't bother trying to parse the raw input received by the server.

  Never use text/plain.

  ---

  If you are writing (or debugging) a library for parsing or generating the raw data, then you need to start worrying about the format. You might also want to know about it for interest's sake.

  application/x-www-form-urlencoded is more or less the same as a query string on the end of the URL.

  multipart/form-data is significantly more complicated but it allows entire files to be included in the data. An example of the result can be found in the HTML 4 specification.

  text/plain is introduced by HTML 5 and is useful only for debugging — from the spec: They are not reliably interpretable by computer — and I'd argue that the others combined with tools (like the Net tab in the developer tools of most browsers) are better for that).

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