Table of Contents
Over the past few weeks, several of our readers have informed us that they received a Pylon 404 error.
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@Heikki Toivonen: A 404 response can contain body text in any text using HTML (or whatever), but there is no redirect. A redirect means that you will be prompted for a URL and the server will work with a different URL that your visitor will load. If someone enters a non-existent Stackoverflow URL on the.com site, looking in their dashboard, you will find that it has not changed in any way. The server did not redirect you to another “error page not found” URL, but simply sent a “page definitely found” message in response to the URL you requested.
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14 April 10 at 0:00
– Wyzard
Output Redirects And HTTP Errors
How to send HTTP redirects and errors in Pyramid versus pylons:
pyramid.httpExceptions
module classes have official HTTP protocol for almost everyoneConditions. These classes are inherited due to Response
Exception
etc.You can either bring them back or educate both men and women. Throwing an ExceptionThis HTTP doesYour code is more structurally readable. This is especially useful inRoutines in which it can neatly cut through multiple call stack framesotherwise, everyone will need if
to pass the error condition.
- Pyramid expanded from within
HTTPNotFound
not if Route is struggling with the request,or not if the view matches the route and request. RunsHTTPForbidden
whenThe request is mostly rejected due to the current authorization policy. - If an uncaught exception is thrown when creating a request, Pyramid will catch it.and consider an “exceptional view” in accordance with information technology. An exceptional view must bethe context argument of which is the exceptional college, its ancestor, or graduation. is anThe interface that it implements. All other terrain predicates must also match;Example: If a real route name is specified as an argument, it must match the real route.Surname. (Thus, skipping a survey is usually registered as clear of the route.name.) na view is usually called an exception object because it has a context, andRegardless of the answer, an overview of the tax return is sent to the mobile phone. So you canUse a view exception to customize the error screen that is presented to the user.
- If no suitable representation of the exception is found, HTTP exceptions almost always belong to them.Please reply to send them to the browser. Standard HTTP exceptions havesimple mistake and layout of the message; Subclasses can customize this easily.
- Replies without an HTTPException to broadcast to the WSGI server. If some kind of debuggingToolbar-Tween is on, it finds the exception and displaysinteractive tracking. Otherwise, the WSGI server will catch it and send itsown server screen “500 Internal Error”.
class | Code | Location | Value |
---|---|---|---|
HTTPMovedPermanently | 301 | J | Constant width = “11%”> |
HTTPFound | 302 | J | Temporary redirect. [1] |
HTTPViewOther | 303 | J | Temporary transfer; should use memberWILL. [1] |
HTTPTemporaryRedirect | 307 | J | Temporary redirect. [1] |
HTTPClientError | 400 | N | General user error; z. B. invalidRequest parameters. |
HTTP Disallowed | 401 | N | User must be authenticated. |
HTTP Disallowed | 403 | N | Authorization failed at allRefusal. |
HTTPNotFound | 404 | N | URL not recognized. |
HTTPGone | 410 | N | The company that was previously at this URL has left; is anOwners must delete them permanentlyBookmark. |
HTTPInternalServerError | 500 | N | Server has failed due toAverage request error. |
The constructor arguments for the classes are the string with the letter “Y”. (location = "", detail = none, headers = none, comment = none, ...)
. vOtherwise, the constructor is the arguments (detail = None, headers = None, comment = None, ...)
. location
Argumentis optional throughout the Python level, but the HTTP specificationa location is required which is a positive url, so it is actually required.
Disagreements over details
can be a simple text loop that is logged.on the error screen. headers
can be retail store for HTTP headers (name-valuetuple) to finally add an answer. Can the comment
become a simple text string containingnot visible to the user (XXX Is the concept registered?)
1 2 3 4th 5 Sixth 7th 8th nineten11th12th13th14thfifteen1617 |
# Pylons - action controllerde pylons.controllers.util Meaning Abort, rejectcancel (404) # foundCancel (403) not # prohibitedabort (400) # Invalid request; z. B. invalid request parametersabort (500) # Internal server errorredirect (url ("section1")) # Redirect (default 302 found)# Pyramid - display in codeimport pyramid.http exceptions as excincrease exc.exception_response (404) # FoundDon't call exc.HTTPNotFound () again Ditto #return exc.HTTPNotFound () # SameIncrease without HTTPBanned ()Raise without HTTPBadRequest ()increase exc.HTTPInternalServerError ()increase exc.HTTPFound (request.route_url ("section1")) # Redirect |
# pylons - during all controller actionsfrom pylons.controllers.util cancel import, redirectcancel (404) # foundDenied (403) probably not # Forbiddenrefuse (400) number Invalid request; z. B. Incorrect difficulty settingabort (500) # Internal device errorredirect (url ("section1")) # Redirect (default 302 found)# Pyramid - view codeimport pyramid.http exceptions as excRaise exc.exception_response (404) Number foundRaise without exception HTTPNotFound () The same numberreturn exc.HTTPNotFound () number SameIncrease without HTTPBanned ()Raise without HTTPBadRequest ()increase exc.HTTPInternalServerError ()enlarge exc.HTTPFound (request.route_url ("section1")) # Views¶You are translating
Exception is required to log an exception representation for some exception classes, although most of themoften done with HTTPNotFound
or HTTPForbidden
. Here is an example forsubmission exclusing a custom exception borrowed from our Pyramid tutorial:
For simplicity, Pyramid provides custom decorators and customization methods forRegister a meaningful “view not found” or a specific “forbidden” view. @notfound_view_config
and (defined @forbidden_view_config
pyramid.view
) supportsA context argument that you can use.
In addition, @notfound_view_config
takes an argument append_slash
,which can be helpful to enforce a strict final slash convention. When your web pages defineall of its routes end with an incredible slash and you set Then append_slash = true
ifa query without a slash does not match almost all routes, Pyramid try again with a nice solid slashadded to the request url. If the route matches this, Pyramid can a. go outredirect to it. This is really only useful for pages that prefer the trailing slash.(“/ directory /” and “/ directory / a /”). I prefer other sitesdon’t use the new slash(“/ dir” and “/ dir / a”), and at the moment there are no special functions for the lineaments this.Readabilitydatatable = “0”>
transport response pyramid.responseClass validation error (exception): to arrive@view_config (context = validation failed)def failed_validation (exc, request): Number. If the view has two complex arguments, the first is fully contextual. # The situation is also always available as a `` request context ''. msg means exc.args [0] if exc.args "" else response = Response ('Authorization failed:% s'% msg) answer.status_int = 500 repeated answer |
transport response pyramid.responseClass validation error (exception): to arrive@view_config (context = validation failed)def failed_validation (exc, request): Number. If the view has a formal argument, the first is the context. # The context is always available as the `` request context ''. msg matches exc.args [0] if exc.args "" different from this response = response ('Verification failed:% s'% msg) answer.status_int = 500 Return answerThe software to fix your PC is just a click away - download it now.