Downloads

Downloads 是一个标准库，基于 Curl，用于满足基本的爬虫需求。 Downloads 支持的各项设置较少，如需更多设置可使用 HTTP 包

request

原型：

request(url;
	[ input = <none>, ]
	[ output = <none>, ]
	[ method = input ? "PUT" : output ? "GET" : "HEAD", ]
	[ headers = <none>, ]
	[ timeout = <none>, ]
	[ progress = <none>, ]
	[ verbose = false, ]
	[ throw = true, ]
	[ downloader = <default>, ]
) -> Union{Response, RequestError}

julia> io=IOBuffer()
IOBuffer(data=UInt8[...], readable=true, writable=true, seekable=true, append=false, size=0, maxsize=Inf, ptr=1, mark=-1)

julia> Downloads.request("http://httpbin.org/user-agent";output=io)
Response("http", "http://httpbin.org/user-agent", 200
...

julia> String(take!(io))
"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0{\n  \"user-agent\": \"curl/7.73.0 julia/1.6\"\n}\n"

download

建议将下载作为它的唯一功能，其它功能用 request 实现

julia> fio=open("D:/foo.png","w")
IOStream(<file D:/foo.png>)

julia> Downloads.download("http://httpbin.org/image/png",fio);