Error In Handling The Request
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other. Join them; it only takes a minute: Sign up Python requests library Exception handling up vote 1 down vote favorite 3 I am creating a download service using the python requests library (See here) to download data from another server. The problem is that sometimes I get a 503 error and I need to display an appropriate message. c# web request error handling See sample code below: import requests s = requests.Session() response = s.get('http://mycustomserver.org/download') I can check from response.status_code and get the status code = 200. But how do I try/catch for a specific error, in this case, I want to be able to detect 503 error and handle them appropriately. How do I do that? python exception python-requests http-status-code-503 share|improve this question asked Jun 16 '14 at 5:37 Frankline 18.8k42452 Look at the code: raw.githubusercontent.com/kennethreitz/requests/master/requests/…, there are many http error codes, there is no exception class for each, instead there is one for all http errors –Christophe Roussy Jun 27 at 8:38 add a comment| 2 Answers 2 active oldest votes up vote 6 down vote accepted Why not do class MyException(Exception); def __init__(self, error_code, error_msg): self.error_code = error_code self.error_msg = error_msg import requests s = requests.Session() response = s.get('http://mycustomserver.org/download') if response.status_code == 503: raise MyException(503, "503 error code") Edit: It seems that requests library will also raise an Exception for you using response.raise_for_status() >>> import requests >>> requests.get('https://google.com/admin')
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2009 January 2008 December 2007 October 2007 Handling Request Validation Exceptions Posted by James Jardine on July 17, 2012 I write a lot requests httperror about the request validation feature built into .Net because I believe it serves a great purpose to help reduce the attack surface of a web application. Although it is possible to bypass it in certain situations, and it is very http://stackoverflow.com/questions/24237185/python-requests-library-exception-handling limited to HTML context cross site scripting attacks, it does provide some built in protection. Previously, I wrote about how request validation works and what it is ultimately looking for. Today I am going to focus on some different ways that request validation exceptions can be handled. No Error Handling How many times have you seen the “Potentially Dangerous Input” error message on an ASP.Net application? This is a sure sign to the user that the application has request https://www.jardinesoftware.net/2012/07/17/handling-request-validation-exceptions/ validation enabled, but that the developers have not taken care to provide friendly error messages. Custom Errors, which is enabled by default, should even hide this message. So if you are seeing this, there is a good chance there are other configuration issues with the site. The following image shows a screen capture of this error message: This is obviously not the first choice in how we want to handle this exception. For one, it gives out a lot of information about our application and it also provides a bad user experience. Users want to have error messages (no one really wants error messages) that match the look and feel of the application. Custom Errors ASP.Net has a feature called “Custom Errors” which is the final catch in the framework for exceptions within an ASP.Net application. If the developer hasn’t handled the exception at all, custom errors picks it up (that is, if it is enabled (default)). Just enabling customer errors is a good idea. If we just set the mode to “On” we get a less informative error message, but it still doesn’t look like the rest of the site. The following code snippet shows what the configuration looks like in the web.config file:
operatives cut undersea cables. You get the picture. Identifying and handling failures helps build fault tolerant systems that stay up even http://dev.mobify.com/blog/http-requests-are-hard/ when services they rely on are down. A nice side effect is your phone is less likely to beep in the middle of the night with a message from your coworkers talking in all caps. This guide will introduce you to the common ways HTTP requests fail and how to handle the failures. The examples use Python's fantastic requests library, but error handling the principles shown work across all languages. You can follow along on your computer by grabbing requests off PyPi. The requests.get(url) method is the cornerstone for all the examples. It makes a synchronous HTTP GET request to fetch the content from url: # Importing `requests` is omitted from here on for brevity. If you are coding # along with the article, request error handling make sure to include before trying the examples! import requests response = requests.get(url="https://www.mobify.com/") Where possible, the examples use httpbin to illustrate the specific failure scenarios. It's a great service for testing how your code will react in a hostile world! The guide assumes familiarly with making HTTP requests and uses the following terminology: Client: The code making the HTTP requests and the server it lives on. Server: The box that delivers the HTTP response we requested. Caller: The code which instantiates the client and tells it to make a request. Ready to make some requests? Let's go! DNS lookup failures HTTP requests can fail before the client can even make a connection to the server. If the URL specified by the caller has a domain name, the client must look up its IP address before making the request. If the domain name doesn't resolve it's possible that it isn't configured correctly or doesn't exist. # This domain name doesn't exist! url = "http://www.definitivelydoesnotexist.com/" try: response = request.get(url) except requests.exceptions.ConnectionError as e: print "These aren't the domains we're looking for." It's important to