请求 response.iter_content() 获取不完整的文件( 1024MB 而不是 1.5GB )? [英] requests response.iter_content() gets incomplete file ( 1024MB instead of 1.5GB )?

问题描述

我一直在使用此代码片段从网站下载文件，到目前为止，小于 1GB 的文件都很好.但我注意到一个 1.5GB 的文件不完整

hi i have been using this code snippet to download files from a website, so far files smaller than 1GB are all good. but i noticed a 1.5GB file is incomplete

# s is requests session object
r = s.get(fileUrl, headers=headers, stream=True)

start_time = time.time()
with open(local_filename, 'wb') as f:
    count = 1
    block_size = 512
    try:
        total_size = int(r.headers.get('content-length'))
        print 'file total size :',total_size
    except TypeError:
        print 'using dummy length !!!'
        total_size = 10000000

    for chunk in r.iter_content(chunk_size=block_size):

        if chunk:  # filter out keep-alive new chunks

            duration = time.time() - start_time
            progress_size = int(count * block_size)
            if duration == 0:
                duration = 0.1
            speed = int(progress_size / (1024 * duration))
            percent = int(count * block_size * 100 / total_size)
            sys.stdout.write("\r...%d%%, %d MB, %d KB/s, %d seconds passed" %
                            (percent, progress_size / (1024 * 1024), speed, duration))

            f.write(chunk)
            f.flush()
            count += 1

使用最新请求 2.2.1 python 2.6.6，centos 6.4文件下载总是在 66.7% 1024MB 处停止，我错过了什么?输出:

using latest requests 2.2.1 python 2.6.6, centos 6.4 the file download always stops at 66.7% 1024MB, what am i missing ? the output:

file total size : 1581244542
...67%, 1024 MB, 5687 KB/s, 184 seconds passed

iter_content() 返回的生成器似乎认为所有块都已检索并且没有错误.顺便说一句，异常部分没有运行，因为服务器确实在响应头中返回了内容长度.

it seems the generator returned by iter_content() thinks all chunks are retrieved and there is no error. btw the exception part did not run, because the server did return the content-length in response header.

推荐答案

请仔细检查您是否可以通过 wget 和/或任何常规浏览器下载文件.可能是服务器限制.正如我所见您的代码可以下载大文件(大于 1.5Gb)

Please double check that you can download the file via wget and/or any regular browser. It could be restriction on the server. As I see your code can download big files (bigger then 1.5Gb)

更新:请尝试反转逻辑 - 而不是

Update: please try to inverse the logic - instead of

if chunk: # filter out keep-alive new chunks                                                                                                                                                                                                         
    f.write(chunk)                                                                                                                                                                                                                                   
    f.flush()

试试

if not chunk:
   break

f.write(chunk)                                                                                                                                                                                                                                   
f.flush()

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