There are lots of resources out there you can read about them.
https://en.wikipedia.org/wiki/Query_string
<https://en.wikipedia.org/wiki/Query_string>
You might want to find a basic tutorial which explains to you how HTTP requests
work as they should explain this and much more.
I presume you have gone through the Flask tutorial at least.
> On 10 Sep 2018, at 10:54 pm, Νικόλαος Κούρας <[email protected]> wrote:
>
> You are right!
> please can you explain to me the difference between and argument and a query
> parameter?
>
> Oh my God, i had almost a week this issue which you helped me resolve!
> Thank you !!!
>
> Στις Δευ, 10 Σεπ 2018 στις 3:11 μ.μ., ο/η Graham Dumpleton
> <[email protected] <mailto:[email protected]>> έγραψε:
>
>
>> On 10 Sep 2018, at 10:08 pm, Νικόλαος Κούρας <[email protected]
>> <mailto:[email protected]>> wrote:
>>
>> /home/nikos/wsgi/ i places my apps and static remains at public_html
>> Configuration now is:
>> DocumentRoot /home/nikos/public_html
>>
>> <Directory /home/nikos/public_html>
>> Require all granted
>> </Directory>
>>
>> <Directory /home/nikos/wsgi>
>> Require all granted
>> </Directory>
>>
>>
>> WSGIDaemonProcess app user=nikos group=nikos home=/home/nikos/public_html
>> WSGIScriptAliasMatch ^/(?!phpmyadmin) /home/nikos/public_html/wsgi/app.py
>> process-group=app application-group=%{GLOBAL}
>>
>> WSGIDaemonProcess clientele user=nikos group=nikos
>> home=/home/nikos/public_html
>> WSGIScriptAlias /clientele /home/nikos/public_html/wsgi/clientele.py
>> process-group=clientele application-group=%{GLOBAL}
>>
>> WSGIDaemonProcess downloads user=nikos group=nikos
>> home=/home/nikos/public_html
>> WSGIScriptAlias /downloads /home/nikos/public_html/wsgi/downloads.py
>> process-group=downloads application-group=%{GLOBAL}
>> =========================
>> I haven't understood your last mail.
>> @app.route( '/' )
>> @app.route( '/<page>' )
>> def index( page=None ):
>>
>> # read environment
>> pdata = ''
>> page = request.args.get('page', 'index.html')
> You are overriding the 'page' argument given to the function, which is what
> you want, with the value of the 'page' query string parameter, which is a
> completely different thing, but because it isn't passed, falls back to using
> 'index.html'.
>
> Comment out the line:
>
> page = request.args.get('page', 'index.html')
>
> Do not use that.
>
>>
>> 'page' variable is supposed to hold the URL parameter givn in browser as
>> 'http://superhost.gr/something <http://superhost.gr/somehting>' no?!
>> It should instead be page = request.args.get(page, 'index.html') you mean?!
>> But why?!
>>
>> Στις Δευ, 10 Σεπ 2018 στις 2:59 μ.μ., ο/η Graham Dumpleton
>> <[email protected] <mailto:[email protected]>> έγραψε:
>> Okay, no I clicked as to what you are trying to do.
>>
>> If you want the path segment, don't use:
>>
>> page = request.args.get('page', 'index.html')
>>
>> Just use the argument given to the function.
>>
>> When you use request.args you are looking at query string parameters.
>>
>> http://superhost.gr?page=xxx.html <http://superhost.gr/?page=xxx.html>
>>
>> They are different things.
>>
>>> On 10 Sep 2018, at 9:56 pm, Νικόλαος Κούρας <[email protected]
>>> <mailto:[email protected]>> wrote:
>>>
>>> [root@superhost public_html]# curl http://superhost.gr
>>> <http://superhost.gr/>
>>> index.html
>>> [root@superhost public_html]# curl http://superhost.gr/clientele
>>> index.html <http://superhost.gr/clienteleindex.html>
>>> As it shows even with an argument passed to the domain '/' page =
>>> request.args.get('page', 'index.html') returns the latter
>>>
>>> Also:
>>> application = Flask(__name__)
>>> app = application
>>> app.debug = True
>>>
>>> Wont display error in browser but still in the error_log text file
>>>
>>> Στις Δευ, 10 Σεπ 2018 στις 2:47 μ.μ., ο/η Graham Dumpleton
>>> <[email protected] <mailto:[email protected]>> έγραψε:
>>> It should not be anywhere under /home/nikos/public_html, not even a sub
>>> directory.
>>>
>>> So use a parallel directory such as:
>>>
>>> /home/nikos/wsgi_apps
>>>
>>> When testing use:
>>>
>>> curl http://superhost.gr/ <http://superhost.gr/>
>>>
>>> Don't trust your browser, as it may have cached that accessing
>>> http://superhost.gr/ <http://superhost.gr/> should redirect to
>>> http://superhost.gr/index.html <http://superhost.gr/index.html>
>>>
>>> If curl works, you will need to clear your browser cache history for
>>> http://superhost.gr/ <http://superhost.gr/>
>>>
>>>> On 10 Sep 2018, at 9:34 pm, Νικόλαος Κούρας <[email protected]
>>>> <mailto:[email protected]>> wrote:
>>>>
>>>> Like this you mean? ialso moved static/ files inside the new wsgi/
>>>> directory because even with the directive in the alias
>>>> home=/home/nikos/public_html templates could not be found
>>>> ====================================
>>>> DocumentRoot /home/nikos/public_html
>>>>
>>>> <Directory /home/nikos/public_html>
>>>> Require all granted
>>>> </Directory>
>>>>
>>>> <Directory /home/nikos/public_html/wsgi>
>>>> Require all granted
>>>> </Directory>
>>>>
>>>>
>>>> WSGIDaemonProcess app user=nikos group=nikos
>>>> WSGIScriptAliasMatch ^/(?!phpmyadmin) /home/nikos/public_html/wsgi/app.py
>>>> process-group=app application-group=%{GLOBAL}
>>>>
>>>> WSGIDaemonProcess clientele user=nikos group=nikos
>>>> WSGIScriptAlias /clientele /home/nikos/public_html/wsgi/clientele.py
>>>> process-group=clientele application-group=%{GLOBAL}
>>>>
>>>> WSGIDaemonProcess downloads user=nikos group=nikos
>>>> WSGIScriptAlias /downloads /home/nikos/public_html/wsgi/downloads.py
>>>> process-group=downloads application-group=%{GLOBAL}
>>>> ====================================
>>>>
>>>> Still the ERROR remains the same after moving to wsgi/
>>>>
>>>> Στις Δευ, 10 Σεπ 2018 στις 1:47 μ.μ., ο/η Graham Dumpleton
>>>> <[email protected] <mailto:[email protected]>> έγραψε:
>>>>
>>>>
>>>>> On 10 Sep 2018, at 8:34 pm, Νικόλαος Κούρας <[email protected]
>>>>> <mailto:[email protected]>> wrote:
>>>>>
>>>>> 1) How do i enable flask so that errors are shown in the browser for m,
>>>>> so i dont have to tail -f error_log all the time?
>>>>>
>>>>> When i was using the flask development server i had this
>>>>>
>>>>> app.run( host='superhost.gr <http://superhost.gr/>', port=5000,
>>>>> debug=True )
>>>>>
>>>>> Now i have commented this out becuas eitsw being run by mod_wsgi and its
>>>>> sending everythign to the error_log text file.
>>>>
>>>> You use:
>>>>
>>>> app.debug = True
>>>>
>>>> See:
>>>>
>>>>
>>>> http://flask.pocoo.org/docs/1.0/api/?highlight=flask%20debug#flask.Flask.debug
>>>>
>>>> <http://flask.pocoo.org/docs/1.0/api/?highlight=flask%20debug#flask.Flask.debug>
>>>>> 2) Regarding this code which not behalfing as it should
>>>>>
>>>>> @app.route( '/<page>' )
>>>>> @app.route( '/' )
>>>>> def index( page=None ):
>>>>>
>>>>> # read environment
>>>>> page = request.args.get('page', 'index.html')
>>>>>
>>>>> When i try via browser:
>>>>>
>>>>> 'http://superhost.gr/ <http://superhost.gr/>' page variable equals to
>>>>> 'index.html'
>>>>> 'http://superhost.gr/ <http://superhost.gr/>something' page variable
>>>>> still equals to 'index.html'
>>>>>
>>>>> How is this possbile under mod_wsgi ?
>>>>
>>>> You shouldn't get index.html in either case if doing things correctly.
>>>>
>>>> The issue may because if I recollect correctly, you had all your .py files
>>>> for the WSGI application under your DocumentRoot directory. You should not
>>>> do that as it can be insecure and wrong configuration elsewhere can lead
>>>> to someone being able to download your source code. Having things in their
>>>> could also cause issues with Apache trying to remap URLs to index files.
>>>>
>>>> Create a directory separate to your DocumentRoot directory and move the
>>>> .py files into it. Then change the WSGIScriptAlias directives to reference
>>>> the new location. You will also need to create a new Directory block for
>>>> the new directory and grant access to being able to serve files from that
>>>> directory.
>>>>
>>>>>
>>>>>
>>>>> Στις Δευ, 10 Σεπ 2018 στις 5:05 π.μ., ο/η Graham Dumpleton
>>>>> <[email protected] <mailto:[email protected]>> έγραψε:
>>>>>
>>>>>
>>>>>> On 10 Sep 2018, at 11:52 am, Νίκος Βέργος <[email protected]
>>>>>> <mailto:[email protected]>> wrote:
>>>>>>
>>>>>> Graham i know you helped me a lot but my script cannot work if i don;t
>>>>>> het this oe sorted out and i'am trying for hours allready.
>>>>>>
>>>>>> Please do help.
>>>>>>
>>>>>>
>>>>>>
>>>>>> I have 3 wsgi scripts listening on 3 locations. What i'm trying to run
>>>>>> an wsgi script from within another wsgi script with the following
>>>>>> statement.
>>>>>>
>>>>>>
>>>>>>
>>>>>> page = 'clientele'
>>>>>> pdata = requests.get( 'http://superhost.gr/ <http://superhost.gr/>' +
>>>>>> page )
>>>>>> pdata = pdata.text + counter
>>>>> Have you tried to add print() statements into your code, when it is
>>>>> running and what variables are at each point? If you use print(), what
>>>>> you print will appear in the Apache error log so you can see it. As per
>>>>> example in requests docs at:
>>>>>
>>>>> http://docs.python-requests.org/en/master/
>>>>> <http://docs.python-requests.org/en/master/>
>>>>>
>>>>> you don't even appear to check the response status code. Check such
>>>>> things, print out the values and see what it is getting.
>>>>>> page = the location of another wsgi app.
>>>>>>
>>>>>> The error i'am getting when for i.e i try to load
>>>>>> http://superhost.gr/clientele <http://superhost.gr/clientele>
>>>>>>
>>>>>> mod_wsgi (pid=7152): Exception occurred processing WSGI script
>>>>>> '/home/nikos/public_html/app.py'
>>>>>> OSError: Apache/mod_wsgi failed to write response data: Broken pipe.
>>>>> This specific message from mod_wsgi indicates that the HTTP client making
>>>>> the request dropped the connection before the server could write the
>>>>> response.
>>>>>
>>>>> So possibly an error is occurring in app.py if that is what is calling it.
>>>>>
>>>>> Have you enabled Flask debug so that errors are shown in the browser for
>>>>> you. If you don't, Flask will just return a 500 error and may not
>>>>> actually log anything about the error. You may need to set up Flask
>>>>> logging so that it logs details of exceptions to the error log.
>>>>>
>>>>> http://flask.pocoo.org/docs/1.0/logging/#logging
>>>>> <http://flask.pocoo.org/docs/1.0/logging/#logging>The other script by
>>>>> itself executes normally but NOT from within my app.py script.
>>>>>>
>>>>>> Any ideas on how to execute a wsgi app (b) from within a wsgi app(a) and
>>>>>> store the response as html data?
>>>>>>
>>>>>>
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