HTTP Post数据对数据量没有指定的限制，因为不同的浏览器对GET有不同的限制。RFC 2068声明:

服务器应谨慎 取决于URI长度大于255 字节，因为一些旧的客户端或 代理实现可能不正确 支持这些长度

具体来说，您应该根据它们的用途选择正确的HTTP结构。HTTP GET不应该有副作用，可以被HTTP代理等安全地刷新和存储。

当您想要针对url资源提交数据时，使用HTTP POST。

使用HTTP GET的一个典型示例是在搜索中，即搜索?查询=我+查询 使用HTTP POST的一个典型示例是向在线表单提交反馈。

短的版本

GET:通常用于已提交的搜索请求，或者任何您希望用户能够再次调出确切页面的请求。

GET的优点:

url可以安全地添加书签。 页面可以安全地重新加载。

GET的缺点:

变量作为名称-值对通过url传递。(安全风险) 可以传递的变量数量有限。(基于浏览器。例如，Internet Explorer被限制为2048个字符。)

POST:用于更高安全性的请求，其中数据可能用于更改数据库，或者您不希望别人添加书签的页面。

POST的优点:

url中不显示名称-值对。(安全+= 1) 可以通过POST传递无限数量的名称-值对。参考。

POST的缺点:

使用POST数据的页面不能被书签。(如果你愿意的话。)

完整版

直接来自超文本传输协议——HTTP/1.1:

9.3 GET The GET method means retrieve whatever information (in the form of an entity) is identified by the Request-URI. If the Request-URI refers to a data-producing process, it is the produced data which shall be returned as the entity in the response and not the source text of the process, unless that text happens to be the output of the process. The semantics of the GET method change to a "conditional GET" if the request message includes an If-Modified-Since, If-Unmodified-Since, If-Match, If-None-Match, or If-Range header field. A conditional GET method requests that the entity be transferred only under the circumstances described by the conditional header field(s). The conditional GET method is intended to reduce unnecessary network usage by allowing cached entities to be refreshed without requiring multiple requests or transferring data already held by the client. The semantics of the GET method change to a "partial GET" if the request message includes a Range header field. A partial GET requests that only part of the entity be transferred, as described in section 14.35. The partial GET method is intended to reduce unnecessary network usage by allowing partially-retrieved entities to be completed without transferring data already held by the client. The response to a GET request is cacheable if and only if it meets the requirements for HTTP caching described in section 13. See section 15.1.3 for security considerations when used for forms. 9.5 POST The POST method is used to request that the origin server accept the entity enclosed in the request as a new subordinate of the resource identified by the Request-URI in the Request-Line. POST is designed to allow a uniform method to cover the following functions: Annotation of existing resources; Posting a message to a bulletin board, newsgroup, mailing list, or similar group of articles; Providing a block of data, such as the result of submitting a form, to a data-handling process; Extending a database through an append operation. The actual function performed by the POST method is determined by the server and is usually dependent on the Request-URI. The posted entity is subordinate to that URI in the same way that a file is subordinate to a directory containing it, a news article is subordinate to a newsgroup to which it is posted, or a record is subordinate to a database. The action performed by the POST method might not result in a resource that can be identified by a URI. In this case, either 200 (OK) or 204 (No Content) is the appropriate response status, depending on whether or not the response includes an entity that describes the result.

简单版本的POST GET PUT DELETE

使用GET -当你想获得任何资源，如基于任何Id或名称的数据列表 使用POST -当你想发送任何数据到服务器。请记住POST是一个重量级操作，因为对于更新，我们应该使用PUT而不是POST POST将创建新的资源 使用PUT -当你

来自RFC 2616:

9.3获得 GET方法意味着检索任何信息(形式为 实体)由 要求通用。如果Request-URI引用 对于数据生成过程，它是 应返回的已生成数据 作为响应中的实体而不是 进程的源文本，除非 这个文本恰好是的输出 这个过程。

9.5 POST The POST method is used to request that the origin server accept the entity enclosed in the request as a new subordinate of the resource identified by the Request-URI in the Request-Line. POST is designed to allow a uniform method to cover the following functions: Annotation of existing resources; Posting a message to a bulletin board, newsgroup, mailing list, or similar group of articles; Providing a block of data, such as the result of submitting a form, to a data-handling process; Extending a database through an append operation. The actual function performed by the POST method is determined by the server and is usually dependent on the Request-URI. The posted entity is subordinate to that URI in the same way that a file is subordinate to a directory containing it, a news article is subordinate to a newsgroup to which it is posted, or a record is subordinate to a database. The action performed by the POST method might not result in a resource that can be identified by a URI. In this case, either 200 (OK) or 204 (No Content) is the appropriate response status, depending on whether or not the response includes an entity that describes the result.

最初的目的是GET用于获取数据，而POST用于任何用途。我使用的经验法则是，如果我要向服务器发送任何东西，我就使用POST。如果我只是调用一个URL来获取数据，我会使用get。

没有什么是你本身做不到的。关键在于您不应该修改HTTP GET上的服务器状态。HTTP代理假设由于HTTP GET不修改状态，那么用户调用HTTP GET一次还是1000次没有区别。使用这些信息，他们认为返回第一个HTTP GET的缓存版本是安全的。如果你破坏了HTTP规范，你就有破坏HTTP客户端和代理的风险。不要这样做:)