Start a 'POST' request to the given URL @param url @return request @throws HttpRequestException

Get the status code of the response @return the response code @throws HttpRequestException

Get the {@link URL} of this request's connection @return request URL

Start a 'DELETE' request to the given URL @param url @return request @throws HttpRequestException

删除方法 这里只会删除某个文件夹下的文件，如果传入的directory是个文件，将不做处理

Start a 'TRACE' request to the given URL @param url @return request @throws HttpRequestException

Get response as {@link String} in given character set <p> This will fall back to using the UTF-8 character set if the given charset is null @param ch

Disconnect the connection @return this request

Open output stream @return this request @throws IOException

Create byte array output stream @return stream

Get 'charset' parameter from 'Content-Type' response header @return charset or null if none

get app version code. @return version code.