Scrapy response download pdf

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If you want to use another field name for the URLs key or for the results key, it is also possible to override it. If you need something more complex and want to override the custom pipeline behaviour, see Extending the Media Pipelines. If you have multiple image pipelines inheriting from ImagePipeline and you want to have different settings in different pipelines you can set setting keys preceded with uppercase name of your pipeline class.

The Image Pipeline avoids downloading files that were downloaded recently. When you use this feature, the Images Pipeline will create thumbnails of the each specified size with this format:. Example of image files stored using small and big thumbnail names:.

It is possible to set just one size constraint or both. When setting both of them, only images that satisfy both minimum sizes will be saved. For the above example, images of sizes x or x or x will all be dropped because at least one dimension is shorter than the constraint. By default media pipelines ignore redirects, i.

To handle media redirections, set this setting to True :. This method is called once per downloaded item. Requests with a higher priority value will execute earlier. Negative values are allowed in order to indicate relatively low-priority. This is used when you want to perform an identical request multiple times, to ignore the duplicates filter. Use it with care, or you will get into crawling loops. Default to False. Callable — a function that will be called if any exception was raised while processing the request.

This includes pages that failed with HTTP errors and such. It receives a Failure as first parameter. For more information, see Using errbacks to catch exceptions in request processing below.

Changed in version 2. A string containing the URL of this request. This attribute is read-only. To change the URL of a Request use replace. A string representing the HTTP method in the request. This is guaranteed to be uppercase. To change the body of a Request use replace. A dict that contains arbitrary metadata for this request. This dict is empty for new Requests, and is usually populated by different Scrapy components extensions, middlewares, etc. So the data contained in this dict depends on the extensions you have enabled.

See Request. This dict is shallow copied when the request is cloned using the copy or replace methods, and can also be accessed, in your spider, from the response.

A dictionary that contains arbitrary metadata for this request. It is empty for new Requests, which means by default callbacks only get a Response object as argument. In case of a failure to process the request, this dict can be accessed as failure.

For more information, see Accessing additional data in errback functions. Return a new Request which is a copy of this Request. See also: Passing additional data to callback functions. Return a Request object with the same members, except for those members given new values by whichever keyword arguments are specified.

The Request. See also Passing additional data to callback functions. Create a Request object from a string containing a cURL command. It accepts the same arguments as the Request class, taking preference and overriding the values of the same arguments contained in the cURL command.

Unrecognized options are ignored by default. To translate a cURL command into a Scrapy request, you may use curl2scrapy. The callback of a request is a function that will be called when the response of that request is downloaded. The callback function will be called with the downloaded Response object as its first argument. In some cases you may be interested in passing arguments to those callback functions so you can receive the arguments later, in the second callback.