Timeout for python requests get entire response

Question

I m gathering statistics on a list of websites and I m using requests for it for simplicity  Here is my code   data    websites   http   google com    http   bbc co uk   for w in websites      r  requests get w  verify False      data append   r url  len r content   r elapsed total seconds    str   l status code  l url  for l in r history    str r headers items     str r cookies items         Now  I want requests get to timeout after 10 seconds so the loop doesn t get stuck    This question has been of interest before too but none of the answers are clean  I will be putting some bounty on this to get a nice answer   I hear that maybe not using requests is a good idea but then how should I get the nice things requests offer   the ones in the tuple

User · Answer

Set the timeout parameter  r   requests get w  verify False  timeout 10    10 seconds  As long as you don t set stream True on that request  this will cause the call to requests get   to timeout if the connection takes more than ten seconds  or if the server doesn t send data for more than ten seconds

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There is a package called timeout-decorator that you can use to time out any python function    timeout decorator timeout 5  def mytest        print  Start       for i in range 1 10           time sleep 1          print     seconds have passed  format i     It uses the signals approach that some answers here suggest  Alternatively  you can tell it to use multiprocessing instead of signals  e g  if you are in a multi-thread environment

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I m using requests 2 2 1 and eventlet didn t work for me  Instead I was able use gevent timeout instead since gevent is used in my service for gunicorn   import gevent import gevent monkey gevent monkey patch all subprocess True  try      with gevent Timeout 5           ret   requests get url          print ret status code  ret content except gevent timeout Timeout as e      print  timeout      format e message    Please note that gevent timeout Timeout is not caught by general Exception handling   So either explicitly catch gevent timeout Timeout  or pass in a different exception to be used like so  with gevent Timeout 5  requests exceptions Timeout   although no message is passed when this exception is raised

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To create a timeout you can use signals   The best way to solve this case is probably to   Set an exception as the handler for the alarm signal Call the alarm signal with a ten second delay Call the function inside a try-except-finally block  The except block is reached if the function timed out  In the finally block you abort the alarm  so it s not singnaled later    Here is some example code   import signal from time import sleep  class TimeoutException Exception           Simple Exception to be called on timeouts          pass  def  timeout signum  frame           Raise an TimeoutException       This is intended for use as a signal handler      The signum and frame arguments passed to this are ignored                 Raise TimeoutException with system default timeout message     raise TimeoutException      Set the handler for the SIGALRM signal  signal signal signal SIGALRM   timeout    Send the SIGALRM signal in 10 seconds  signal alarm 10   try            Do our code      print  This will take 11 seconds          sleep 11      print  done    except TimeoutException      print  It timed out    finally        Abort the sending of the SIGALRM signal      signal alarm 0    There are some caveats to this    It is not threadsafe  signals are always delivered to the main thread  so you can t put this in any other thread  There is a slight delay after the scheduling of the signal and the execution of the actual code  This means that the example would time out even if it only slept for ten seconds    But  it s all in the standard python library  Except for the sleep function import it s only one import  If you are going to use timeouts many places You can easily put the TimeoutException   timeout and the singaling in a function and just call that  Or you can make a decorator and put it on functions  see the answer linked below   You can also set this up as a  context manager  so you can use it with the with statement   import signal class Timeout            Timeout for use with the  with  statement           class TimeoutException Exception               Simple Exception to be called on timeouts              pass      def  timeout signum  frame               Raise an TimeoutException           This is intended for use as a signal handler          The signum and frame arguments passed to this are ignored                       raise Timeout TimeoutException        def   init   self  timeout 10           self timeout   timeout         signal signal signal SIGALRM  Timeout  timeout       def   enter   self           signal alarm self timeout       def   exit   self  exc type  exc value  traceback           signal alarm 0          return exc type is Timeout TimeoutException    Demonstration  from time import sleep  print  This is going to take maximum 10 seconds      with Timeout 10       sleep 15      print  No timeout    print  Done     One possible down side with this context manager approach is that you can t know if the code actually timed out or not   Sources and recommended reading    The documentation on signals This answer on timeouts by  David Narayan  He has organized the above code as a decorator

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UPDATE  https   requests readthedocs io en master user advanced  timeouts In new version of requests  If you specify a single value for the timeout  like this  r   requests get  https   github com   timeout 5   The timeout value will be applied to both the connect and the read timeouts  Specify a tuple if you would like to set the values separately  r   requests get  https   github com   timeout  3 05  27    If the remote server is very slow  you can tell Requests to wait forever for a response  by passing None as a timeout value and then retrieving a cup of coffee  r   requests get  https   github com   timeout None    My old  probably outdated  answer  which was posted long time ago   There are other ways to overcome this problem  1  Use the TimeoutSauce internal class From  https   github com kennethreitz requests issues 1928 issuecomment-35811896  import requests from requests adapters import TimeoutSauce  class MyTimeout TimeoutSauce       def   init   self   args    kwargs           connect   kwargs get  connect   5          read   kwargs get  read   connect          super MyTimeout  self    init   connect connect  read read   requests adapters TimeoutSauce   MyTimeout  This code should cause us to set the read timeout as equal to the connect timeout  which is the timeout value you pass on your Session get   call   Note that I haven t actually tested this code  so it may need some quick debugging  I just wrote it straight into the GitHub window    2  Use a fork of requests from kevinburke  https   github com kevinburke requests tree connect-timeout From its documentation  https   github com kevinburke requests blob connect-timeout docs user advanced rst  If you specify a single value for the timeout  like this  r   requests get  https   github com   timeout 5   The timeout value will be applied to both the connect and the read timeouts  Specify a tuple if you would like to set the values separately  r   requests get  https   github com   timeout  3 05  27     kevinburke has requested it to be merged into the main requests project  but it hasn t been accepted yet

User · Answer

If it comes to that  create a watchdog thread that messes up requests  internal state after 10 seconds  e g     closes the underlying socket  and ideally triggers an exception if requests retries the operation   Note that depending on the system libraries you may be unable to set deadline on DNS resolution

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timeout    connection timeout  data read timeout  or give a single argument timeout 1   import requests  try      req   requests request  GET    https   www google com  timeout  1 1       print req  except requests ReadTimeout      print  READ TIME OUT

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Just another one solution  got it from http   docs python-requests org en master user advanced  streaming-uploads   Before upload you can find out the content size   TOO LONG   10 1024 1024    10 Mb big url    http   ipv4 download thinkbroadband com 1GB zip  r   requests get big url  stream True  print  r headers  content-length      1073741824    if int r headers  content-length     lt  TOO LONG        upload content      content   r content   But be careful  a sender can set up incorrect value in the  content-length  response field

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Despite the question being about requests  I find this very easy to do with pycurl CURLOPT TIMEOUT or CURLOPT TIMEOUT MS   No threading or signaling required   import pycurl import StringIO  url    http   www example com example zip  timeout ms   1000 raw   StringIO StringIO   c   pycurl Curl   c setopt pycurl TIMEOUT MS  timeout ms     total timeout in milliseconds c setopt pycurl WRITEFUNCTION  raw write  c setopt pycurl NOSIGNAL  1  c setopt pycurl URL  url  c setopt pycurl HTTPGET  1  try      c perform   except pycurl error      traceback print exc     error generated on timeout     pass   or just pass if you don t want to print the error

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Well  I tried many solutions on this page and still faced instabilities  random hangs  poor connections performance   I m now using Curl and i m really happy about it s  max time  functionnality and about the global performances  even with such a poor implementation    content commands getoutput  curl -m6 -Ss  http   mywebsite xyz      Here  I defined a 6 seconds max time parameter  englobing both connection and transfer time   I m sure Curl has a nice python binding  if you prefer to stick to the pythonic syntax

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this code working for socketError 11004 and 10060          - - encoding UTF-8 - -   author      ACE  import requests from PyQt4 QtCore import   from PyQt4 QtGui import     class TimeOutModel QThread       Existed   pyqtSignal bool      TimeOut   pyqtSignal        def   init   self  fun  timeout 500  parent None                        param fun  function or lambda          param timeout  ms                     super TimeOutModel  self    init   parent          self fun   fun          self timeer   QTimer self          self timeer setInterval timeout          self timeer timeout connect self time timeout          self Existed connect self timeer stop          self timeer start            self setTerminationEnabled True       def time timeout self           self timeer stop           self TimeOut emit           self quit           self terminate        def run self           self fun     bb   lambda  requests get  http   ipv4 download thinkbroadband com 1GB zip    a   QApplication      z   TimeOutModel bb  500  print  timeout   a exec

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Set stream True and use r iter content 1024   Yes  eventlet Timeout just somehow doesn t work for me   try      start   time       timeout   5     with get config  source    online    stream True  timeout timeout  as r          r raise for status           content   bytes           content gen   r iter content 1024          while True              if time  -start  gt  timeout                  raise TimeoutError  Time out      seconds   format timeout               try                  content    next content gen              except StopIteration                  break         data   content decode   split   n           if len data  in  0  1               raise ValueError  Bad requests data   except  exceptions RequestException  ValueError  IndexError  KeyboardInterrupt          TimeoutError  as e      print e      with open config  source    local    as f          data    line strip   for line in f readlines      The discussion is here https   redd it 80kp1h

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In case you re using the option stream True you can do this   r   requests get       http   url to large file       timeout 1     relevant only for underlying socket     stream True   with open   tmp out file txt     wb   as f      start time   time time       for chunk in r iter content chunk size 1024           if chunk     filter out keep-alive new chunks             f write chunk          if time time   - start time  gt  8              raise Exception  Request took longer than 8s     The solution does not need signals or multiprocessing

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This may be overkill  but the Celery distributed task queue has good support for timeouts   In particular  you can define a soft time limit that just raises an exception in your process  so you can clean up  and or a hard time limit that terminates the task when the time limit has been exceeded   Under the covers  this uses the same signals approach as referenced in your  before  post  but in a more usable and manageable way   And if the list of web sites you are monitoring is long  you might benefit from its primary feature -- all kinds of ways to manage the execution of a large number of tasks

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I came up with a more direct solution that is admittedly ugly but fixes the real problem  It goes a bit like this   resp   requests get some url  stream True  resp raw  fp fp  sock settimeout read timeout    This will load the entire response even though stream is set content   resp content   You can read the full explanation here

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Try this request with timeout  amp  error handling   import requests try       url    http   google com      r   requests get url  timeout 10  except requests exceptions Timeout as e       print e

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timeout   int seconds  Since  requests  gt   2 4 0   you can use the timeout argument  i e  requests get  https   duckduckgo com    timeout 10    Note   timeout is not a time limit on the entire response download  rather  an exception is raised if the server has not issued a response for timeout seconds   more precisely  if no bytes have been received on the underlying socket for timeout seconds   If no timeout is specified explicitly  requests do not time out

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I believe you can use multiprocessing and not depend on a 3rd party package   import multiprocessing import requests  def call with timeout func  args  kwargs  timeout       manager   multiprocessing Manager       return dict   manager dict          define a wrapper of  return dict  to store the result      def function return dict           return dict  value     func  args    kwargs       p   multiprocessing Process target function  args  return dict        p start          Force a max   timeout  or wait for the process to finish     p join timeout         If thread is still active  it didn t finish  raise TimeoutError     if p is alive            p terminate           p join           raise TimeoutError     else          return return dict  value    call with timeout requests get  args  url    kwargs   timeout   10   timeout 60    The timeout passed to kwargs is the timeout to get any response from the server  the argument timeout is the timeout to get the complete response

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What about using eventlet  If you want to timeout the request after 10 seconds  even if data is being received  this snippet will work for you   import requests import eventlet eventlet monkey patch    with eventlet Timeout 10       requests get  http   ipv4 download thinkbroadband com 1GB zip   verify False

[python] Timeout for python requests.get entire response

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