QNetworkAccessManager and redirections

**alexandernst** · 17th September 2010, 16:46

I have problems handling redirects using QNetworkAccessManager. Could I get some help? Example code here: http://pastebin.com/bu7rWx2X

I can't get the file that I want (hosted on sourceforge) using the first link in the code, but if I use the second link (commented), I get the file without problems.

I know that this is almost only-c++-code forum, but the code is ~50 lines and I haven't used python-specific things. Only Qt calls.

Thanks

**alexandernst** · 18th September 2010, 19:37

Not a single reply? Nobody knows something about QNAM and redirections?

**Talei** · 18th September 2010, 22:30

I looked briefly on Your code, so maybe I'm wrong on this - also tired from all day work ;/, but why do You use https for sourceforge?, try http.
Also try to use WireShark and capture Your request and browser request and compare both. That's probably fastest way to figure out why this don't work.

**alexandernst** · 19th September 2010, 04:32

I use https because that's the link. Qt should be able to manage that link. Also, going the Wireshark way is way too wrong for that problem. That is clearly a Qt bug.
Both wget and curl are perfectly able to handle that link, so Qt should be able to handle it too. Could somebody try to run the code or maybe even better, point me to the right direction.

**wysota** · 19th September 2010, 07:14

Maybe you need to handle the redirection yourself. I'm not sure QNetworkAccessManager does that on its own. There are situations when you'd like to know a redirection is in place and not actually follow it blindly so I guess it could be that QNetworkAccessManager will not make the second request automatically.

**alexandernst** · 19th September 2010, 14:37

wysota, I already handle the redirections. I'm here because I'm doing something wrong and I need and example/advice.

**wysota** · 19th September 2010, 19:47

So what happens exactly if you use the first link? Did you connect appropriate signals and slots regarding handling ssl errors as it says in the docs?

**alexandernst** · 20th September 2010, 13:21

Yes, I connected the appropriate signals. I also manage sslErrors signal, but no ssl errors happen at all.
In my app I get a 302 with the same URL but http instead of https. Then I get a 200 with exactly the same URL as from the 302 redirection. And it stops there.

Using wget I get 302, 302, 302 and then 200. I also saw a cookie, but I don't know how to implement/use them with my code. I haven't found any example about doing that.

**wysota** · 20th September 2010, 13:24

Originally Posted by alexandernst

Then I get a 200 with exactly the same URL as from the 302 redirection. And it stops there.

And what would you expect? 200 is the last status code in chain, there are no more requests after that. Did you look at the headers you get with the response?

**alexandernst** · 20th September 2010, 13:37

I'm not sure if I'm looking them the right way. I use this:

for item in reply.rawHeaderList():
print "HEADER: " + reply.rawHeader(str(item))

**wysota** · 20th September 2010, 13:55

And what do you get?

**alexandernst** · 20th September 2010, 21:01

This is what I get using my app:

Qt Code:

Switch view

UPDATE: 163 of 163
ERROR CODE: (302, True)
HEADER: nginx/0.7.63
HEADER: Mon, 20 Sep 2010 20:00:07 GMT
HEADER: text/html; charset=UTF-8
HEADER: close
HEADER: sf.consume=fc962df5a9f7681b705057aa739f02d9b40bdab2gAJ9cQEoVQhfZXhwaXJlc3ECY2RhdGV0aW1lCmRhdGV0aW1lCnEDVQoH9gETAw4HAAAAhVJxBFUDX2lkcQVVIGViNjkxNjc2YTNhZGNjYjhkNWE3ZGYyODQwM2EwZjQwcQZVDl9hY2Nlc3NlZF90aW1lcQdHQdMl71HYCOFVDl9jcmVhdGlvbl90aW1lcQhHQdMl71HYCN11Lg==; expires=Tue, 19-Jan-2038 03:14:07 GMT; Path=/
HEADER: http://sourceforge.net/projects/python-jake/files/betas/Jake-PyQT4-0.1.zip/download
HEADER: 163
REDIRECT: PyQt4.QtCore.QUrl(u'http://sourceforge.net/projects/python-jake/files/betas/Jake-PyQT4-0.1.zip/download')
UPDATE: 697 of 17593
UPDATE: 2145 of 17593
UPDATE: 3593 of 17593
UPDATE: 5041 of 17593
UPDATE: 6489 of 17593
UPDATE: 7937 of 17593
UPDATE: 9385 of 17593
UPDATE: 10833 of 17593
UPDATE: 12281 of 17593
UPDATE: 13729 of 17593
UPDATE: 15177 of 17593
UPDATE: 16625 of 17593
UPDATE: 17593 of 17593
ERROR CODE: (200, True)
HEADER: nginx/0.7.63
HEADER: Mon, 20 Sep 2010 20:00:08 GMT
HEADER: text/html; charset=utf-8
HEADER: close
HEADER: no-cache
HEADER: no-cache
HEADER: VISITOR=4c97bd47d3179d696c000c1b; expires="Thu, 17-Sep-2020 20:00:08 GMT"; httponly; Max-Age=315360000; Path=/
sf.consume=18a7bbdc908cf4ebec1332d6b6582817c21d4817gAJ9cQEoVQhfZXhwaXJlc3ECY2RhdGV0aW1lCmRhdGV0aW1lCnEDVQoH9gETAw4HAAAAhVJxBFUFcHJlZnNxBX1xBlUOdXNlc19yZWxhdGlvbnNxB4lVB3ZlcnNpb25xCFUBMlUDa2V5cQlVGDRjOTdiZDQ3ZDMxNzlkNjk2YzAwMGMxYnEKVQNfaWRxC1UgYjhjNzIwZTg0YTIwMTEyYTllMWNlODE0NjIxNjU0NTVxDFUOX2FjY2Vzc2VkX3RpbWVxDUdB0yXvUiUFHVUOX2NyZWF0aW9uX3RpbWVxDkdB0yXvUiUD/3Uu; expires=Tue, 19-Jan-2038 03:14:07 GMT; Path=/
HEADER: 17593

UPDATE: 163 of 163
ERROR CODE: (302, True)
HEADER: nginx/0.7.63
HEADER: Mon, 20 Sep 2010 20:00:07 GMT
HEADER: text/html; charset=UTF-8
HEADER: close
HEADER: sf.consume=fc962df5a9f7681b705057aa739f02d9b40bdab2gAJ9cQEoVQhfZXhwaXJlc3ECY2RhdGV0aW1lCmRhdGV0aW1lCnEDVQoH9gETAw4HAAAAhVJxBFUDX2lkcQVVIGViNjkxNjc2YTNhZGNjYjhkNWE3ZGYyODQwM2EwZjQwcQZVDl9hY2Nlc3NlZF90aW1lcQdHQdMl71HYCOFVDl9jcmVhdGlvbl90aW1lcQhHQdMl71HYCN11Lg==; expires=Tue, 19-Jan-2038 03:14:07 GMT; Path=/
HEADER: http://sourceforge.net/projects/python-jake/files/betas/Jake-PyQT4-0.1.zip/download
HEADER: 163
REDIRECT: PyQt4.QtCore.QUrl(u'http://sourceforge.net/projects/python-jake/files/betas/Jake-PyQT4-0.1.zip/download')
UPDATE: 697 of 17593
UPDATE: 2145 of 17593
UPDATE: 3593 of 17593
UPDATE: 5041 of 17593
UPDATE: 6489 of 17593
UPDATE: 7937 of 17593
UPDATE: 9385 of 17593
UPDATE: 10833 of 17593
UPDATE: 12281 of 17593
UPDATE: 13729 of 17593
UPDATE: 15177 of 17593
UPDATE: 16625 of 17593
UPDATE: 17593 of 17593
ERROR CODE: (200, True)
HEADER: nginx/0.7.63
HEADER: Mon, 20 Sep 2010 20:00:08 GMT
HEADER: text/html; charset=utf-8
HEADER: close
HEADER: no-cache
HEADER: no-cache
HEADER: VISITOR=4c97bd47d3179d696c000c1b; expires="Thu, 17-Sep-2020 20:00:08 GMT"; httponly; Max-Age=315360000; Path=/
sf.consume=18a7bbdc908cf4ebec1332d6b6582817c21d4817gAJ9cQEoVQhfZXhwaXJlc3ECY2RhdGV0aW1lCmRhdGV0aW1lCnEDVQoH9gETAw4HAAAAhVJxBFUFcHJlZnNxBX1xBlUOdXNlc19yZWxhdGlvbnNxB4lVB3ZlcnNpb25xCFUBMlUDa2V5cQlVGDRjOTdiZDQ3ZDMxNzlkNjk2YzAwMGMxYnEKVQNfaWRxC1UgYjhjNzIwZTg0YTIwMTEyYTllMWNlODE0NjIxNjU0NTVxDFUOX2FjY2Vzc2VkX3RpbWVxDUdB0yXvUiUFHVUOX2NyZWF0aW9uX3RpbWVxDkdB0yXvUiUD/3Uu; expires=Tue, 19-Jan-2038 03:14:07 GMT; Path=/
HEADER: 17593

To copy to clipboard, switch view to plain text mode

and it hangs there.

And this is what I get with wget:

Qt Code:

Switch view

--2010-09-20 22:11:01--  https://sourceforge.net/projects/python-jake/files/betas/Jake-PyQT4-0.1.zip/download
Resolviendo sourceforge.net... 216.34.181.60
Connecting to sourceforge.net|216.34.181.60|:443... conectado.
PeticiÃ³n HTTP enviada, esperando respuesta... 302 Found
LocalizaciÃ³n: http://sourceforge.net/projects/python-jake/files/betas/Jake-PyQT4-0.1.zip/download [siguiendo]
--2010-09-20 22:11:02--  http://sourceforge.net/projects/python-jake/files/betas/Jake-PyQT4-0.1.zip/download
Connecting to sourceforge.net|216.34.181.60|:80... conectado.
PeticiÃ³n HTTP enviada, esperando respuesta... 302 Found
LocalizaciÃ³n: http://downloads.sourceforge.net/project/python-jake/betas/Jake-PyQT4-0.1.zip?r=&ts=1285012816&use_mirror=garr [siguiendo]
--2010-09-20 22:11:02--  http://downloads.sourceforge.net/project/python-jake/betas/Jake-PyQT4-0.1.zip?r=&ts=1285012816&use_mirror=garr
Resolviendo downloads.sourceforge.net... 216.34.181.59
Connecting to downloads.sourceforge.net|216.34.181.59|:80... conectado.
PeticiÃ³n HTTP enviada, esperando respuesta... 302 Found
LocalizaciÃ³n: http://garr.dl.sourceforge.net/project/python-jake/betas/Jake-PyQT4-0.1.zip [siguiendo]
--2010-09-20 22:11:03--  http://garr.dl.sourceforge.net/project/python-jake/betas/Jake-PyQT4-0.1.zip
Resolviendo garr.dl.sourceforge.net... 193.206.140.34, 2001:760:ffff:b0::34
Connecting to garr.dl.sourceforge.net|193.206.140.34|:80... conectado.
PeticiÃ³n HTTP enviada, esperando respuesta... 200 OK
Longitud: 1218027 (1,2M) [application/zip]
Saving to: `Jake-PyQT4-0.1.zip'
 
100%[===================================================================================================================================================================================================>] 1.218.027    547K/s   in 2,2s    
 
2010-09-20 22:11:05 (547 KB/s) - `Jake-PyQT4-0.1.zip' saved [1218027/1218027]

--2010-09-20 22:11:01--  https://sourceforge.net/projects/python-jake/files/betas/Jake-PyQT4-0.1.zip/download
Resolviendo sourceforge.net... 216.34.181.60
Connecting to sourceforge.net|216.34.181.60|:443... conectado.
PeticiÃ³n HTTP enviada, esperando respuesta... 302 Found
LocalizaciÃ³n: http://sourceforge.net/projects/python-jake/files/betas/Jake-PyQT4-0.1.zip/download [siguiendo]
--2010-09-20 22:11:02--  http://sourceforge.net/projects/python-jake/files/betas/Jake-PyQT4-0.1.zip/download
Connecting to sourceforge.net|216.34.181.60|:80... conectado.
PeticiÃ³n HTTP enviada, esperando respuesta... 302 Found
LocalizaciÃ³n: http://downloads.sourceforge.net/project/python-jake/betas/Jake-PyQT4-0.1.zip?r=&ts=1285012816&use_mirror=garr [siguiendo]
--2010-09-20 22:11:02--  http://downloads.sourceforge.net/project/python-jake/betas/Jake-PyQT4-0.1.zip?r=&ts=1285012816&use_mirror=garr
Resolviendo downloads.sourceforge.net... 216.34.181.59
Connecting to downloads.sourceforge.net|216.34.181.59|:80... conectado.
PeticiÃ³n HTTP enviada, esperando respuesta... 302 Found
LocalizaciÃ³n: http://garr.dl.sourceforge.net/project/python-jake/betas/Jake-PyQT4-0.1.zip [siguiendo]
--2010-09-20 22:11:03--  http://garr.dl.sourceforge.net/project/python-jake/betas/Jake-PyQT4-0.1.zip
Resolviendo garr.dl.sourceforge.net... 193.206.140.34, 2001:760:ffff:b0::34
Connecting to garr.dl.sourceforge.net|193.206.140.34|:80... conectado.
PeticiÃ³n HTTP enviada, esperando respuesta... 200 OK
Longitud: 1218027 (1,2M) [application/zip]
Saving to: `Jake-PyQT4-0.1.zip'

100%[===================================================================================================================================================================================================>] 1.218.027    547K/s   in 2,2s    

2010-09-20 22:11:05 (547 KB/s) - `Jake-PyQT4-0.1.zip' saved [1218027/1218027]

To copy to clipboard, switch view to plain text mode

**wysota** · 20th September 2010, 21:05

You are only showing header values and not keys (I think I can guess them correctly though). One thing I would surely do is to return the cookie set by the first request with the second request.

**alexandernst** · 20th September 2010, 21:19

Yup, exactly! That's the thing that I don't know how to do. How do I return the cookie?
Also, how do I show to header values + keys?

**wysota** · 20th September 2010, 21:32

Originally Posted by alexandernst

Yup, exactly! That's the thing that I don't know how to do. How do I return the cookie?

Setting a cookie jar for your QNAM should be enough. If not then you'll have to set the "Cookie" header in the second request.

Also, how do I show to header values + keys?

QNetworkReply::rawHeaderList() probably returns a list of header names (or "key: value" pairs).

**alexandernst** · 21st September 2010, 07:16

Ok, now I'm setting a cookieJar this way:

Qt Code:

Switch view

self.manager = QNetworkAccessManager()
    self.jar = QNetworkCookieJar()
    self.manager.setCookieJar(self.jar)

self.manager = QNetworkAccessManager()
    self.jar = QNetworkCookieJar()
    self.manager.setCookieJar(self.jar)

To copy to clipboard, switch view to plain text mode

but I keep getting the same output.
I also managed to show the keys&values if you wish to see the output:

Qt Code:

Switch view

UPDATE: 163 of 163
ERROR CODE: (302, True)
HEADER: Server === nginx/0.7.63
HEADER: Date === Tue, 21 Sep 2010 06:11:40 GMT
HEADER: Content-Type === text/html; charset=UTF-8
HEADER: Connection === close
HEADER: Set-cookie === sf.consume=dbbb479a1e149425adaf118787d664ea2a761e9dgAJ9cQEoVQhfZXhwaXJlc3ECY2RhdGV0aW1lCmRhdGV0aW1lCnEDVQoH9gETAw4HAAAAhVJxBFUDX2lkcQVVIDk1YWNiNmQxYzQzNjBkNjk0NjRmNzVkNThmM2Y5NzNmcQZVDl9hY2Nlc3NlZF90aW1lcQdHQdMmEycBVPhVDl9jcmVhdGlvbl90aW1lcQhHQdMmEycBVPN1Lg==; expires=Tue, 19-Jan-2038 03:14:07 GMT; Path=/
HEADER: Location === http://sourceforge.net/projects/python-jake/files/betas/Jake-PyQT4-0.1.zip/download
HEADER: Content-Length === 163
REDIRECT: PyQt4.QtCore.QUrl(u'http://sourceforge.net/projects/python-jake/files/betas/Jake-PyQT4-0.1.zip/download')
UPDATE: 697 of 17537
UPDATE: 2145 of 17537
UPDATE: 3593 of 17537
UPDATE: 5041 of 17537
UPDATE: 6489 of 17537
UPDATE: 7937 of 17537
UPDATE: 9385 of 17537
UPDATE: 10833 of 17537
UPDATE: 12281 of 17537
UPDATE: 13729 of 17537
UPDATE: 15177 of 17537
UPDATE: 17537 of 17537
ERROR CODE: (200, True)
HEADER: Server === nginx/0.7.63
HEADER: Date === Tue, 21 Sep 2010 06:11:40 GMT
HEADER: Content-Type === text/html; charset=utf-8
HEADER: Connection === close
HEADER: Pragma === no-cache
HEADER: Cache-Control === no-cache
HEADER: Set-cookie === VISITOR=4c984c9c91aa911ff50011b7; expires="Fri, 18-Sep-2020 06:11:40 GMT"; httponly; Max-Age=315360000; Path=/
sf.consume=74bd0beb5266058fee435c8078db828cf65ffcaagAJ9cQEoVQhfZXhwaXJlc3ECY2RhdGV0aW1lCmRhdGV0aW1lCnEDVQoH9gETAw4HAAAAhVJxBFUFcHJlZnNxBX1xBlUOdXNlc19yZWxhdGlvbnNxB4lVB3ZlcnNpb25xCFUBMlUDa2V5cQlVGDRjOTg0YzljOTFhYTkxMWZmNTAwMTFiN3EKVQNfaWRxC1UgZWRmNmM5MzZmMjczZjFlNmI1ZTdkZjE1ZDk4ZTIyZjlxDFUOX2FjY2Vzc2VkX3RpbWVxDUdB0yYTJxjnklUOX2NyZWF0aW9uX3RpbWVxDkdB0yYTJxjmuHUu; expires=Tue, 19-Jan-2038 03:14:07 GMT; Path=/
HEADER: Content-Length === 17537

UPDATE: 163 of 163
ERROR CODE: (302, True)
HEADER: Server === nginx/0.7.63
HEADER: Date === Tue, 21 Sep 2010 06:11:40 GMT
HEADER: Content-Type === text/html; charset=UTF-8
HEADER: Connection === close
HEADER: Set-cookie === sf.consume=dbbb479a1e149425adaf118787d664ea2a761e9dgAJ9cQEoVQhfZXhwaXJlc3ECY2RhdGV0aW1lCmRhdGV0aW1lCnEDVQoH9gETAw4HAAAAhVJxBFUDX2lkcQVVIDk1YWNiNmQxYzQzNjBkNjk0NjRmNzVkNThmM2Y5NzNmcQZVDl9hY2Nlc3NlZF90aW1lcQdHQdMmEycBVPhVDl9jcmVhdGlvbl90aW1lcQhHQdMmEycBVPN1Lg==; expires=Tue, 19-Jan-2038 03:14:07 GMT; Path=/
HEADER: Location === http://sourceforge.net/projects/python-jake/files/betas/Jake-PyQT4-0.1.zip/download
HEADER: Content-Length === 163
REDIRECT: PyQt4.QtCore.QUrl(u'http://sourceforge.net/projects/python-jake/files/betas/Jake-PyQT4-0.1.zip/download')
UPDATE: 697 of 17537
UPDATE: 2145 of 17537
UPDATE: 3593 of 17537
UPDATE: 5041 of 17537
UPDATE: 6489 of 17537
UPDATE: 7937 of 17537
UPDATE: 9385 of 17537
UPDATE: 10833 of 17537
UPDATE: 12281 of 17537
UPDATE: 13729 of 17537
UPDATE: 15177 of 17537
UPDATE: 17537 of 17537
ERROR CODE: (200, True)
HEADER: Server === nginx/0.7.63
HEADER: Date === Tue, 21 Sep 2010 06:11:40 GMT
HEADER: Content-Type === text/html; charset=utf-8
HEADER: Connection === close
HEADER: Pragma === no-cache
HEADER: Cache-Control === no-cache
HEADER: Set-cookie === VISITOR=4c984c9c91aa911ff50011b7; expires="Fri, 18-Sep-2020 06:11:40 GMT"; httponly; Max-Age=315360000; Path=/
sf.consume=74bd0beb5266058fee435c8078db828cf65ffcaagAJ9cQEoVQhfZXhwaXJlc3ECY2RhdGV0aW1lCmRhdGV0aW1lCnEDVQoH9gETAw4HAAAAhVJxBFUFcHJlZnNxBX1xBlUOdXNlc19yZWxhdGlvbnNxB4lVB3ZlcnNpb25xCFUBMlUDa2V5cQlVGDRjOTg0YzljOTFhYTkxMWZmNTAwMTFiN3EKVQNfaWRxC1UgZWRmNmM5MzZmMjczZjFlNmI1ZTdkZjE1ZDk4ZTIyZjlxDFUOX2FjY2Vzc2VkX3RpbWVxDUdB0yYTJxjnklUOX2NyZWF0aW9uX3RpbWVxDkdB0yYTJxjmuHUu; expires=Tue, 19-Jan-2038 03:14:07 GMT; Path=/
HEADER: Content-Length === 17537

To copy to clipboard, switch view to plain text mode

What am I doing wrong?

**wysota** · 21st September 2010, 07:25

Check if the cookie is sent back with the second request. Also, what is the content of the second reply?

**alexandernst** · 21st September 2010, 08:21

How can I check if the cookie was sent back?

I think you can see the content of the second reply in my last post. Or you mean another thing?

**wysota** · 21st September 2010, 08:31

Originally Posted by alexandernst

How can I check if the cookie was sent back?

Either dump headers of the second request or run some network sniffer to check what goes through the network. You may use this one: NetworqDebugger.

I think you can see the content of the second reply in my last post. Or you mean another thing?

The content of the second reply is 17537 bytes long and you did not show it to us.

**alexandernst** · 21st September 2010, 09:05

That's because the app dies there. It just gets to the redirect and waits for something...
I'll try wireshark when I'm at home.

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QNetworkAccessManager and redirections

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