使用没有 Gzip 编码的 POST 检索 JSON 内容后，无法解码任何 JSON 对象答案

【问题标题】：No JSON object could be decoded after retrieving JSON content using POST without Gzip encoding使用没有 Gzip 编码的 POST 检索 JSON 内容后，无法解码任何 JSON 对象
【发布时间】：2015-07-10 07:50:41
【问题描述】：

使用 Python 2.7.8，如果运行此脚本，我们会得到“ValueError: No JSON object could be decoded”：

from urllib2 import urlopen, Request
from json import dumps, loads, load

values = dumps({
    "issueId": 10600,
    "versionId": "10000",
    "cycleId": "16",
    "projectId": 10000
})
headers = {"Content-Type": "application/json"}
request = Request("http://private-anon-491d363a1-getzephyr.apiary-mock.com/jira_server/rest/zapi/latest/execution", data=values, headers=headers)
print request.get_method()
print request.get_header("Content-Encoding")

response = urlopen(request)
print "\n" + response.read()
print response.getcode()
print response.geturl()
print response.info()
json = loads(response.read())  # raises ValueError("No JSON object could be decoded")

输出是：

POST
None

{
    "32": {
        "id": 32,
        "executionStatus": "-1",
        "comment": "",
        "htmlComment": "",
        "cycleId": 16,
        "cycleName": "Audit Test Cycle 3",
        "versionId": 10000,
        "versionName": "v1",
        "projectId": 10000,
        "issueId": 10600,
        "issueKey": "ZFJ-19",
        "summary": "test - check1",
        "label": "",
        "component": ""
    }
}
200
http://private-anon-491d363a1-getzephyr.apiary-mock.com/jira_server/rest/zapi/latest/execution
Server: Cowboy
X-Apiary-Ratelimit-Limit: 120
X-Apiary-Ratelimit-Remaining: 119
Content-Type: application/json
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: OPTIONS,GET,HEAD,POST,PUT,DELETE,TRACE,CONNECT
Access-Control-Max-Age: 10
X-Apiary-Transaction-Id: 55423c1c7996e10300e32acc
Date: Thu, 30 Apr 2015 14:28:45 GMT
X-Cache: MISS from p-proxy.int.hrs.com
X-Cache-Lookup: MISS from p-proxy.int.hrs.com:3128
Via: 1.1 vegur, 1.0 p-proxy.int.hrs.com:3128 (squid/2.6.STABLE6)
Proxy-Connection: close

Traceback (most recent call last):
  File "test2.py", line 20, in <module>
    json = loads(response.read())  # raises ValueError("No JSON object could be decoded")
  File "C:\Program Files (x86)\python27\lib\json\__init__.py", line 338, in loads
    return _default_decoder.decode(s)
  File "C:\Program Files (x86)\python27\lib\json\decoder.py", line 366, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "C:\Program Files (x86)\python27\lib\json\decoder.py", line 384, in raw_decode
    raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded

我阅读了很多涉及 Gzip 和 requests lib 等方面的问答，但没有帮助。如何使用 urlib2 和 json 库解码响应？如果我将响应复制到一个文件中并解析该文件，它就可以工作，因此它是有效的 json。

【问题讨论】：

标签： python json python-2.7 urllib2 jira-zephyr

【解决方案1】：

你不能 .read() 文件类对象（根据 docs urlopen 返回）两次。我修改了你的代码，试试看：

from urllib2 import urlopen, Request
from json import dumps, loads, load

values = dumps({
    "issueId": 10600,
    "versionId": "10000",
    "cycleId": "16",
    "projectId": 10000
})
headers = {"Content-Type": "application/json"}
request = Request("http://private-anon-491d363a1-getzephyr.apiary-mock.com/jira_server/rest/zapi/latest/execution", data=values, headers=headers)
print request.get_method()
print request.get_header("Content-Encoding")

response = urlopen(request)
text = response.read()         #storing the data
print "\n" + text              #note the usage of the stored string
print response.getcode()
print response.geturl()
print response.info()
json = loads(text)             #note the usage of the stored string

【讨论】：

post方法怎么样？

【解决方案2】：

您应该将内容存储到一个变量中并对该变量进行解码。 response.read() 的 sencod 调用不会得到任何数据。

简单的解决方案：

content = response.read()
json = loads(content)

【讨论】：