the openstreetmap engine imports code from the wikidata engine.
before this commit, specific code make sure to copy the logger variable to the wikidata engine.
with this commit searx.engines.load_engine makes sure the .logger is initialized.
The implementation scans sys.modules for module name starting with searx.engines.
close#298
This is a workaround: inside engine code, any call to function in another engine can crash
since the logger won't be initialized except if it is done explicitly.
Instead of raising an exception and therefore hiding all results of the engine.
It make sense to remove that requirement in order to allow the implementation of
search engines that do not always have a description. In fact some search
engines that in 99% of the case have a description like Brave Search or Mojeek
crash completely if they for some reason included a result with no description.
To test this patch try Mojeek:
!mjk xyz
before and after the patch.
Suggested-by: 0xhtml in https://github.com/searx/searx/discussions/2933
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
Pylint 2.10 added new default checks [1]:
use-list-literal
Emitted when list() is called with no arguments instead of using []
use-dict-literal
Emitted when dict() is called with no arguments instead of using {}
[1] https://pylint.pycqa.org/en/latest/whatsnew/2.10.html
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
The implementation uses the Qwant API (https://api.qwant.com/v3). The API is
undocumented but can be reverse engineered by reading the network log of
https://www.qwant.com/ queries.
This implementation is used by different qwant engines in the settings.yml::
- name: qwant
categories: general
...
- name: qwant news
categories: news
...
- name: qwant images
categories: images
...
- name: qwant videos
categories: videos
...
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
In the EU there exists a "General Data Protection Regulation" [1] aka GDPR (BTW:
very user friendly!) which requires consent to tracking. To get the consent
from the user, google-news requests are redirected to confirm and get a CONSENT
Cookie from https://consent.google.de/s?continue=...
This patch adds a CONSENT Cookie to the google-news request to avoid
redirection.
The behavior of the CONTENTS cookies over all google engines seems similar but
the pattern is not yet fully clear to me, here are some random samples from my
analysis ..
Using common google search from different domains::
google.com: CONSENT=YES+cb.{{date}}-14-p0.de+FX+816
google.de: CONSENT=YES+cb.{{date}}-14-p0.de+FX+333
google.fr: CONSENT=YES+srp.gws-{{date}}-0-RC2.fr+FX+826
When searching about videos (google-videos)::
google.es: CONSENT=YES+srp.gws-{{date}}-0-RC2.es+FX+076
google.de: CONSENT=YES+srp.gws-{{date}}-0-RC2.de+FX+171
Google news has only one domain for all languages::
news.google.com: CONSENT=YES+cb.{{date}}-14-p0.de+FX+816
Using google-scholar search from different domains::
scholar.google.de: CONSENT=YES+cb.{{date}}-14-p0.de+FX+333
scholar.google.fr: does not use such a cookie / did not ask the user
scholar.google.es: does not use such a cookie / did not ask the user
Interim summary:
Pattern is unclear and I won't apply the CONSENT cookie to all google engines.
More experience is need before we generalize the CONSENT cookies over all
google engines.
Related:
- e9a6ab401 [fix] youtube - send CONSENT Cookie to not be redirected
- https://github.com/benbusby/whoogle-search/issues/311
- https://github.com/benbusby/whoogle-search/issues/243
[1] https://en.wikipedia.org/wiki/General_Data_Protection_Regulation
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
Since we added
- 1c67b6aec [enh] google engine: supports "default language"
there is a KeyError: 'hl in request,error pattern::
ERROR:searx.searx.search.processor.online:engine google news : exception : 'hl'
Traceback (most recent call last):
File "searx/search/processors/online.py", line 144, in search
search_results = self._search_basic(query, params)
File "searx/search/processors/online.py", line 118, in _search_basic
self.engine.request(query, params)
File "searx/engines/google_news.py", line 97, in request
if lang_info['hl'] == 'en':
KeyError: 'hl'
Closes: https://github.com/searxng/searxng/issues/154
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
Same behaviour behaviour than Whoogle [1]. Only the google engine with the
"Default language" choice "(all)"" is changed by this patch.
When searching for a locate place, the result are in the expect language,
without missing results [2]:
> When a language is not specified, the language interpretation is left up to
> Google to decide how the search results should be delivered.
The query parameters are copied from Whoogle. With the ``all`` language:
- add parameter ``source=lnt``
- don't use parameter ``lr``
- don't add a ``Accept-Language`` HTTP header.
The new signature of function ``get_lang_info()`` is:
lang_info = get_lang_info(params, lang_list, custom_aliases, supported_any_language)
Argument ``supported_any_language`` is True for google.py and False for the other
google engines. With this patch the function now returns:
- query parameters: ``lang_info['params']``
- HTTP headers: ``lang_info['headers']``
- and as before this patch:
- ``lang_info['subdomain']``
- ``lang_info['country']``
- ``lang_info['language']``
[1] https://github.com/benbusby/whoogle-search
[2] https://github.com/benbusby/whoogle-search/releases/tag/v0.5.4
Loading an engine should not exit the application (*). Instead
of exit, return None.
(*) RuntimeError still exit the application: syntax error, etc...
BTW: add documentation and normalize indentation (no functional change)
Suggested-by: @dalf https://github.com/searxng/searxng/pull/116#issuecomment-851865627
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
Slightly modified merge of commit [1cb1d3ac] from searx [PR 2543]:
This adds Docker Hub .. as a search engine .. the engine's favicon was
downloaded from the Docker Hub website with wget and converted to a PNG
with ImageMagick .. It supports the parsing of URLs, titles, content,
published dates, and thumbnails of Docker images.
[1cb1d3ac] https://github.com/searx/searx/pull/2543/commits/1cb1d3ac
[PR 2543] https://github.com/searx/searx/pull/2543
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
To test & demonstrate this implementation download:
https://liste.mediathekview.de/filmliste-v2.db.bz2
and unpack into searx/data/filmliste-v2.db, in your settings.yml define a sqlite
engine named "demo"::
- name : demo
engine : sqlite
shortcut: demo
categories: general
result_template: default.html
database : searx/data/filmliste-v2.db
query_str : >-
SELECT title || ' (' || time(duration, 'unixepoch') || ')' AS title,
COALESCE( NULLIF(url_video_hd,''), NULLIF(url_video_sd,''), url_video) AS url,
description AS content
FROM film
WHERE title LIKE :wildcard OR description LIKE :wildcard
ORDER BY duration DESC
disabled : False
Query to test: "!demo concert"
This is a rewrite of the implementation from commit [1]
[1] searx/searx@8e90a21
Suggested-by: @virtadpt searx/searx#2808
- Use result 'alt_description' as title, if not given use
default title 'unknown'.
- Use result 'description' from unsplash as 'content'
Fix error::
DEBUG:searx:result: invalid title: {..., 'title': None, 'content': '', 'engine': 'unsplash'}
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
Remove 'template' from result. Engine genius should
not use the video template. BTW: fix indentations
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
- pylint searx/engines/xpath.py
- fix indentation of some long lines
- add logging
- add doc-strings
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
Make 'soft_max_redirects' configurable per Xpath engine::
- name : <engine-name>
engine : xpath
soft_max_redirects: 1
...
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
it prepares the new architecture change,
everything about multithreading in moved in the searx.search.* packages
previously the call to the "init" function of the engines was done in searx.engines:
* the network was not set (request not sent using the defined proxy)
* it requires to monkey patch the code to avoid HTTP requests during the tests
- add to list of pylint scripts
- add debug log messages
- move API key int `settings.yml`
- improved readability
- add some metadata to results
Signed-off-by: Markus Heiser <markus@darmarit.de>
Springer Nature is a global publisher dedicated to providing service to research
community [1] with official API [2].
To test this PR, first get your API key following this page:
https://dev.springernature.com/signup
In searx/engines/springer.py at line 24, add this API key. I left my own key,
commented out in the line aboce. Feel free to use it, if needed.
[1] https://www.springernature.com/
[2] https://dev.springernature.com/
In the EU there exists a "General Data Protection Regulation" [1] aka GDPR (BTW:
very user friendly!) which requires consent to tracking. To get the consent
from the user, youtube requests are redirected to confirm and get a CONSENT
Cookie from https://consent.youtube.com
This patch adds a CONSENT Cookie to the youtube request to avoid redirection.
[1] https://en.wikipedia.org/wiki/General_Data_Protection_Regulation
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
Reported-by: https://github.com/searx/searx/issues/2774
Report to the user suspended engines.
searx.search.processor.abstract:
* manages suspend time (per network).
* reports suspended time to the ResultContainer (method extend_container_if_suspended)
* adds the results to the ResultContainer (method extend_container)
* handles exceptions (method handle_exception)
I also found some items missing a thumbnail and I used text_extract for content
and title, to remove unneeded whitespaces.
BTW: added bandcamp's favicon
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
settings.yml:
* outgoing.networks:
* can contains network definition
* propertiers: enable_http, verify, http2, max_connections, max_keepalive_connections,
keepalive_expiry, local_addresses, support_ipv4, support_ipv6, proxies, max_redirects, retries
* retries: 0 by default, number of times searx retries to send the HTTP request (using different IP & proxy each time)
* local_addresses can be "192.168.0.1/24" (it supports IPv6)
* support_ipv4 & support_ipv6: both True by default
see https://github.com/searx/searx/pull/1034
* each engine can define a "network" section:
* either a full network description
* either reference an existing network
* all HTTP requests of engine use the same HTTP configuration (it was not the case before, see proxy configuration in master)
fr.wikipedia.org (and it seems not other wikipedia websites),
adds HTML to api_result['displayTitle'].
(Search for '!wp :fr Braid' for example)
The commit uses api_result['title']
The get_cliend_id() function:
* fetches https://soundcloud.com
* then fetches each referenced javascript URL to get the client id.
This commit fetches the javascript URLs in the reverse order: the client id is in the last javascript URL.
Many things have been changed since last review of this engine. This patch fix
xpath selectors, implements suggestion and is a complete review / rewrite of the
engine.
Signed-off-by: Markus Heiser <markus@darmarit.de>
When initing engines a "SearxEngineResponseException" is logged very verbose,
including full traceback information:
ERROR:searx.engines:yggtorrent engine: Fail to initialize
Traceback (most recent call last):
File "share/searx/searx/engines/__init__.py", line 293, in engine_init
init_fn(get_engine_from_settings(engine_name))
File "share/searx/searx/engines/yggtorrent.py", line 42, in init
resp = http_get(url, allow_redirects=False)
File "share/searx/searx/poolrequests.py", line 197, in get
return request('get', url, **kwargs)
File "share/searx/searx/poolrequests.py", line 190, in request
raise_for_httperror(response)
File "share/searx/searx/raise_for_httperror.py", line 60, in raise_for_httperror
raise_for_captcha(resp)
File "share/searx/searx/raise_for_httperror.py", line 43, in raise_for_captcha
raise_for_cloudflare_captcha(resp)
File "share/searx/searx/raise_for_httperror.py", line 30, in raise_for_cloudflare_captcha
raise SearxEngineCaptchaException(message='Cloudflare CAPTCHA', suspended_time=3600 * 24 * 15)
searx.exceptions.SearxEngineCaptchaException: Cloudflare CAPTCHA, suspended_time=1296000
For SearxEngineResponseException this is not needed. Those types of exceptions
can be a normal use case. E.g. for CAPTCHA errors like shown in the example
above. It should be enough to log a warning for such issues:
WARNING:searx.engines:yggtorrent engine: Fail to initialize // Cloudflare CAPTCHA, suspended_time=1296000
closes: #2612
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
The old xpath configuration for google scholar did not work and is replaced by a
python implementation.
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
Bing has a list of regions that it supports and some of these regions
may have more than one possible language.
In some cases, like Switzerland, these languages are always shown as
options, so there is no issue. But in other cases, like Andorra, Bing
will only show one language at the time, either the region's default or
the request's language if the latter is supported by that region.
For example, if the HTTP request is in French, Andorra will appear as
fr-AD but if the same page is requested in any other language Andorra
will appear as ca-AD.
This is specially a problem when Bing assumes that the request is in
English because it overrides enough language codes to make several major
languages like Arabic dissappear from the languages.py file.
To avoid that issue, I set the Accept-Language header to a language
that's only supported in one region to hopefully avoid these overrides.
At the moment videos without a description are not shown - setting
default content to "" fixes this.
Another current bug is that thumbnails are not displayed. This is caused
by a double slash in the url. For this every trailing slash is now
stripped (for backwards compatibility) and the API response is correctly
parsed.
* searx understand "!ddg !g time" as : send "!g time" to DDG
* !g a DDG bang for Google: DDG return a HTTP redirect to Google
This commit adds a the allows_redirect param not to follow HTTP redirect.
The DDG engine returns a empty result as before without HTTP redirect.
on some queries (like an IT error message), wikipedia returns an HTTP error 400.
this commit returns an empty result instead of showing an error to the user.
Some JSON API returns HTML in either in the HTML or the content.
This commit adds two new parameters to the json_engine:
content_html_to_text and title_html_to_text, False by default.
If True, then the searx.utils.html_to_text removes the HTML tags.
Update crossref, openairedatasets and openairepublications engines
The language_support variable is set to True by default,
and set to False in only 5 engines.
Except the documentation and the /config URL, this variable is not used.
This commit remove the variable definition in the engines, and
set value according to supported_languages length: False when the length is 0,
True otherwise.
Close#2485
Avoid SearxEngineXPathException errors when parsing non valid results::
.//div[@class="yuRUbf"]//a/@href index 0 not found
Traceback (most recent call last):
File "./searx/engines/google.py", line 274, in response
url = eval_xpath_getindex(result, href_xpath, 0)
File "./searx/searx/utils.py", line 608, in eval_xpath_getindex
raise SearxEngineXPathException(xpath_spec, 'index ' + str(index) + ' not found')
searx.exceptions.SearxEngineXPathException: .//div[@class="yuRUbf"]//a/@href index 0 not found
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
BTW: make the engines ready for search.checker:
- replace eval_xpath by eval_xpath_getindex and eval_xpath_list
- google_images: remove outer try/except block
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
The 'video.html' template from the 'oscar' design supports replacement
for *author* and *length*. Google-videos does not have an author, alternatively
the publisher info from is used for the *author*.
Hint: these replacements are not supported by the 'simple' design.
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
This revise is based on the methods developed in the revise of the google engine
(see commit 410c2f9).
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
This revise is based on the methods developed in the revise of the google engine
(see commit 410c2f9).
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
see searx.search.processors.abstract.EngineProcessor
First the method searx call the get_params method.
If the return value is not None, then the searx call the method search.
check HTTP response:
* detect some comme CAPTCHA challenge (no solving). In this case the engine is suspended for long a time.
* otherwise raise HTTPError as before
the check is done in poolrequests.py (was before in search.py).
update qwant, wikipedia, wikidata to use raise_for_httperror instead of raise_for_status
before commit 58d72f2, category was not set in xpath.py,
so searx/engines/__init__py was setting the category to ['general']
the commit 58d72f2 set the category to [] which is not replaced by searx/engines/__init__.py
consequence: the mojeek engine is hidden in the preferences.
this commit revert the xpath.py change.
close#2368
Add a new parameter "raise_for_status", set by default to True.
When True, any HTTP status code >= 300 raise an exception ( #2332 )
When False, the engine can manage the HTTP status code by itself.
- strip html tags and superfluous quotation marks from content
- remove not needed cookie from request
- remove superfluous imports
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
Error pattern::
Engines cannot retrieve results:
digg (unexpected crash time data '2020-10-16T14:09:55Z' does not match format '%Y-%m-%d %H:%M:%S')
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
recoll is a local search engine based on Xapian:
http://www.lesbonscomptes.com/recoll/
By itself recoll does not offer web or API access,
this can be achieved using recoll-webui:
https://framagit.org/medoc92/recollwebui.git
This engine uses a custom 'files' result template
set `base_url` to the location where recoll-webui can be reached
set `dl_prefix` to a location where the file hierarchy as indexed by recoll can be reached
set `search_dir` to the part of the indexed file hierarchy to be searched, use an empty string to search the entire search domain
Devian's request and response forms has been changed.
- fixed title
- fixed time_range_dict to 'popular-*-***'
- use image from <noscript> if exists
- drop obsolete "http to https, remove domain sharding"
- use query URL https://www.deviantart.com/search/deviations?page=5&q=foo
- add searx/engines/deviantart.py to pylint check (test.pylint)
Error pattern::
There DEBUG:searx:result: invalid title: {'url': 'https://www.deviantart.com/ ...
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
use
from searx.engines.duckduckgo import _fetch_supported_languages, supported_languages_url # NOQA
so it is possible to easily remove all unused import using autoflake:
autoflake --in-place --recursive --remove-all-unused-imports searx tests
Xpath engine and results template changed to account for the fact that
archive.org doesn't cache .onions, though some onion engines migth have
their own cache.
Disabled by default. Can be enabled by setting the SOCKS proxies to
wherever Tor is listening and setting using_tor_proxy as True.
Requires Tor and updating packages.
To avoid manually adding the timeout on each engine, you can set
extra_proxy_timeout to account for Tor's (or whatever proxy used) extra
time.
- remove paging support: a "vqd" parameter is required between each request. This parameter is uniq for each request
- update the URL (no redirect), use the POST method
- language support: works if there is no more than request per minute, otherwise it is ignored !
Since 1. October 2020 google has changed the 'class' attribute of the HTML
result page.
Fix the xpath expressions and ignore <div class="g" ../> sections which do not
match to title's xpath expression.
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
A new "base" engine called command is introduced. It is the foundation for all command line engines for now.
You can use this engine to create your own command line engine.
Add some engines (commented out to make sure no one enables anything accidentally):
* git grep: This engine lets you grep in the searx repo.
* locate: If locate is installed and initialized, you can search on the FS.
* find: You can find files with a specific name from where you started searx.
* pattern search in files: This engine utilizes the command fgrep.
* regex search in files: This engine runs `grep` to find a file based on its contents.
and some other exceptions:
* KeyboardInterrupt
* SystemExit
* RuntimeError
* SystemError
* ImportError: an engine with an unmet dependency will stop everything.
A new option is added to engines to hide error messages from users. It
is called `display_error_messages` and by default it is set to `True`.
If it is set to `False` error messages do not show up on the UI.
Keep in mind that engines are still suspended if needed regardless of
this setting.
Closes#1828
The gigablast API has changed and seems to have some quirks, this is the first
revise. More work (hacks) are needed.
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
Since there are zero results, we can remove it:
$ make engines.languages
fetch languages ..
...
fetched 0 languages from engine gigablast
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
datetime.parser.parse() does not know the Spanish date format which
leads to a ValueError. Fixes#1870
Traceback (most recent call last):
File "/usr/local/searx/searx/search.py", line 160, in search_one_http_request_safe
search_results = search_one_http_request(engine, query, request_params)
File "/usr/local/searx/searx/search.py", line 97, in search_one_http_request
return engine.response(response)
File "/usr/local/searx/searx/engines/startpage.py", line 102, in response
published_date = parser.parse(date_string, dayfirst=True)
File "/usr/local/searx/searx-ve/lib/python3.6/site-packages/dateutil/parser/_parser.py", line 1358, in parse
return DEFAULTPARSER.parse(timestr, **kwargs)
File "/usr/local/searx/searx-ve/lib/python3.6/site-packages/dateutil/parser/_parser.py", line 649, in parse
raise ValueError("Unknown string format:", timestr)
ValueError: ('Unknown string format:', '24 Ene 2013')
When selecting other languages than 'en', bing-video did not handle the language
correct and gave very bad results. Since User-Agent is normaly rotated in
searx, the behavior of a !biv search was unpredictable and paging was broken.
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
The bing_news bug (discussed in #1838) was caused by wrong language tags, which
was fixed e0c99d9d / no need to change the bing_news search string.
closes: https://github.com/asciimoo/searx/issues/1838
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
Fix this error while travis build::
/home/travis/build/asciimoo/searx/searx/engines/duckduckgo_definitions.py:21:44: E225 missing whitespace around operator
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
This PR fixes the result count from bing which was throwing an (hidden) error and add a validation to avoid reading more results than avalaible.
For example :
If there is 100 results from some search and we try to get results from 120 to 130, Bing will send back the results from 0 to 10 and no error. If we compare results count with the first parameter of the request we can avoid this "invalid" results.
Characters that were not ASCII were incorrectly decoded.
Add an helper function: searx.utils.ecma_unescape (Python implementation of unescape Javascript function).
* Search URL is https://www.wikidata.org/w/index.php?{query}&ns0=1 (with ns0=1 at the end to avoid an HTTP redirection)
* url_detail: remove the disabletidy=1 deprecated parameter
* Add eval_xpath function: compile once for all xpath.
* Add get_id_cache: retrieve all HTML with an id, avoid the slow to procress dynamic xpath '//div[@id="{propertyid}"]'.replace('{propertyid}')
* Create an etree.HTMLParser() instead of using the global one (see #1575)
Fetch complete JSON data block, use legend to extract images.
Unquote urlencoded strings.
Add image description as 'content'.
Add 'img_format' and 'source' data (needs PR #1567 to enable this data to be displayed).
Show images which lack ownerid instead of discarding them.
use data from embedded JSON to improve results (e.g. real page title), add image format and source info (see PR #1567), improve paging logic (it now works)
- Because there is not full image url in the dom, we replace "image_url" with the same url as the "url" (url of source).
See example HTML https://gist.github.com/Nachtalb/2dea8a4d2c723c49226ad9645838121f
- Remove unused import
- Fix google image search title
- Keep google image safe value up to date
Searching for english is now giving all pages results.
Instead searching for a specific language different from english
is correctly returning only translated pages for the selected language.
Add match_language function in utils to match any user given
language code with a list of engine's supported languages.
Also add language_aliases dict on each engine to translate
standard language codes into the custom codes used by the engine.
SearX currently doesn't start up when run with Python 3 as it tries to parse the
settings.yml file with ASCII codecs.
There are similar problems with engines_languages.json and currencies.json
Python 3 requires that files with Unicode characters be read with a 'b' flag.
This also works with Python 2 and hence can be integrated into the main source
code.
Tested with the latest Python 3.6.4rc1 on Debian unstable.
Signed-off-by: Joseph Nuthalapati <njoseph@thoughtworks.com>
languages.py can change, so users may query on a language that is not
on the list anymore, even if it is still recognized by a few engines.
also made no and nb the same because they seem to return the same,
though most engines will only support one or the other.
If no language is specified, bing returns results with multiple languages
for one query which isn't really useful. Setting english as default
insted if nothing.
The timeouts in settings.yml is about the total time (not only the HTTP request but also the prepare the request and parsing the response)
It was more or less the case before since the threaded_requests function ignores the thread after the timeout even the HTTP request is ended.
New / changed stats :
* page_load_time : record the HTTP request time
* page_load_count: the number of HTTP request
* engine_time : the execution total time of an engine
* engine_time_count : the number of "engine_time" measure
The avg response times in the preferences are the engine response time (engine_load_time / engine_load_count)
To sum up :
* Search.search() filters the engines that can't process the request
* Search.search() call search_multiple_requests function
* search_multiple_requests creates one thread per engine, each thread runs the search_one_request function
* search_one_request calls the request function, make the HTTP request, calls the response function, extends the result_container
* search_multiple_requests waits for the the thread to finish (or timeout)
Making WA search hits contain
- the (parsed) input inside the "title" instead of just "Wolfram|Alpha", to better match other hit titles and to confirm correct parsing of input to the user
- the first output field that contains any text (skipping ones that are only pictures; this is usually the most meaningful "result" field) instead of the raw input as the "content", making it additionally possible to obtain WA computations from JSON API calls
