python requests get方式怎么设置请求头？
Header可以通过Request提供的.add_header()方法进行添加，示例代码如下：
123456789101112# -*- coding:utf-8 -*-
import urllib2import urlliburl = 'http://ah.example.com'half_url = u'/servlet/av/jd?
ai=782&ji=2624743&sn=I'#构造get请求req = urllib2.
Request(url+half_url.
encode('utf-8'))#添加headerreq.add_header('AcceptEncoding', 'gzip,deflate')req.
add_header('User-Agent','Mozilla/5.0')response = urllib2.
urlopen(req)
print response.
Requests支持流式上传，这允许你发送大的数据流或文件而无需先把它们读入内存。要使用流式上传，仅需为你的请求体提供一个类文件对象即可。
读取文件请使用字节的方式，这样Requests会生成正确的Content-Length。
with open('massive-body', 'rb') as f:
requests.post('http://some.url/streamed', data=f)分块传输编码
对于出去和进来的请求，Requests也支持分块传输编码。要发送一个块编码的请求，仅需为你的请求体提供一个生成器
注意生成器输出应该为bytes
def gen():
yield b'hi'
yield b'there'
requests.post('http://some.url/chunked', data=gen())
For chunked encoded responses, it's best to iterate over the data
using Response.iter_content(). In an ideal situation you'll have set stream=True on the
request, in which case you can iterate chunk-by-chunk by calling iter_content with a chunk
size parameter of None. If you want to set a maximum size of the chunk, you can set a chunk
size parameter to any integer.
