Server Transfer Vs Response Redirect

Question

What is difference between Server Transfer and Response Redirect    What are advantages and disadvantages of each  When is one appropriate over the other  When is one not appropriate

User · Accepted Answer

Response Redirect simply sends a message  HTTP 302  down to the browser   Server Transfer happens without the browser knowing anything  the browser request a page  but the server returns the content of another

User · Answer

The beauty of Server Transfer is what you can do with it   TextBox myTxt    TextBox this Page PreviousPage FindControl  TextBoxID      You can get anything from your previous page using the above method as long as you use Server Transfer but not Response Redirect

User · Answer

Transfer is entirely server-side   Client address bar stays constant   Some complexity about the transfer of context between requests   Flushing and restarting page handlers can be expensive so do your transfer early in the pipeline e g  in an HttpModule during BeginRequest   Read the MSDN docs carefully  and test and understand the new values of HttpContext Request - especially in Postback scenarios   We usually use Server Transfer for error scenarios   Redirect terminates the request with a 302 status and client-side roundtrip response with and internally eats an exception  minor server perf hit - depends how many you do a day   Client then navigates to new address   Browser address bar  amp  history updates etc   Client pays the cost of an extra roundtrip - cost varies depending on latency   In our business we redirect a lot we wrote our own module to avoid the exception cost

User · Answer

response redirect  and  server transfer  helps to transfer user from one page to other page while the page is executing  But the way they do this transfer   redirect is very different    In case you are visual guy and would like see demonstration rather than theory I would suggest to see the below facebook video which explains the difference in a more demonstrative way   https   www facebook com photo php v 762186150488997   The main difference between them is who does the transfer  In  response redirect  the transfer is done by the browser while in  server transfer  it   s done by the server  Let us try to understand this statement in a more detail manner   In  Server Transfer  following is the sequence of how transfer happens -  1 User sends a request to an ASP NET page  In the below figure the request is sent to  WebForm1  and we would like to navigate to  Webform2    2 Server starts executing  Webform1  and the life cycle of the page starts  But before the complete life cycle of the page is completed    Server transfer    happens to  WebForm2     3  Webform2  page object is created  full page life cycle is executed and output HTML response is then sent to the browser      While in  Response Redirect  following is the sequence of events for navigation -  1 Client  browser  sends a request to a  page  In the below figure the request is sent to  WebForm1  and we would like to navigate to  Webform2    2 Life cycle of  Webform1  starts executing  But in between of the life cycle  Response Redirect  happens   3 Now rather than server doing a redirect   he sends a HTTP 302 command to the browser  This command tells the browser that he has to initiate a GET request to  Webform2 aspx  page   4 Browser interprets the 302 command and sends a GET request for  Webform2 aspx      In other words  Server Transfer  is executed by the server while  Response Redirect  is executed by thr browser   Response Redirect  needs to two requests to do a redirect of the page   So when to use  Server Transfer  and when to use  Response Redirect     Use  Server Transfer  when you want to navigate pages which reside on the same server  use  Response Redirect  when you want to navigate between pages which resides on different server and domain     Below is a summary table of which chalks out differences and in which scenario to use

User · Answer

Just more details about Transfer    it s actually is Server Execute     Response End    its source code is below  from Mono  net 4 0   public void Transfer  string path  bool preserveForm        this Execute  path  null  preserveForm  true       this context Response End        and for Execute    what it is to run is the handler of the given path  see  ASP NET does not verify that the current user is authorized to view the resource delivered by the Execute method  Although the ASP NET authorization and authentication logic runs before the original resource handler is called  ASP NET directly calls the handler indicated by the Execute method and does not rerun authentication and authorization logic for the new resource  If your application s security policy requires clients to have appropriate authorization to access the resource  the application should force reauthorization or provide a custom access-control mechanism  You can force reauthorization by using the Redirect method instead of the Execute method  Redirect performs a client-side redirect in which the browser requests the new resource  Because this redirect is a new request entering the system  it is subjected to all the authentication and authorization logic of both Internet Information Services  IIS  and ASP NET security policy  -from MSDN

User · Answer

Response Redirect involves an extra round trip and updates the address bar   Server Transfer does not cause the address bar to change  the server responds to the request with content from another page  e g   Response Redirect -   On the client the browser requests a page http   InitiallyRequestedPage aspx On the server responds to the request with 302 passing the redirect address http   AnotherPage aspx  On the client the browser makes a second request to the address http   AnotherPage aspx  On the server responds with content from http   AnotherPage aspx    Server Transfer -   On the client browser requests a page http   InitiallyRequestedPage aspx On the server Server Transfer to http   AnotherPage aspx On the server the response is made to the request for http   InitiallyRequestedPage aspx passing back content from http   AnotherPage aspx   Response Redirect  Pros - RESTful - It changes the address bar  the address can be used to record changes of state inbetween requests    Cons - Slow - There is an extra round-trip between the client and server   This can be expensive when there is substantial latency between the client and the server   Server Transfer  Pros - Quick   Cons - State lost -  If you re using Server Transfer to change the state of the application in response to post backs  if the page is then reloaded that state will be lost  as the address bar will be the same as it was on the first request

User · Answer

Transfer is entirely server-side   Client address bar stays constant   Some complexity about the transfer of context between requests   Flushing and restarting page handlers can be expensive so do your transfer early in the pipeline e g  in an HttpModule during BeginRequest   Read the MSDN docs carefully  and test and understand the new values of HttpContext Request - especially in Postback scenarios   We usually use Server Transfer for error scenarios   Redirect terminates the request with a 302 status and client-side roundtrip response with and internally eats an exception  minor server perf hit - depends how many you do a day   Client then navigates to new address   Browser address bar  amp  history updates etc   Client pays the cost of an extra roundtrip - cost varies depending on latency   In our business we redirect a lot we wrote our own module to avoid the exception cost

User · Answer

Response Redirect involves an extra round trip and updates the address bar   Server Transfer does not cause the address bar to change  the server responds to the request with content from another page  e g   Response Redirect -   On the client the browser requests a page http   InitiallyRequestedPage aspx On the server responds to the request with 302 passing the redirect address http   AnotherPage aspx  On the client the browser makes a second request to the address http   AnotherPage aspx  On the server responds with content from http   AnotherPage aspx    Server Transfer -   On the client browser requests a page http   InitiallyRequestedPage aspx On the server Server Transfer to http   AnotherPage aspx On the server the response is made to the request for http   InitiallyRequestedPage aspx passing back content from http   AnotherPage aspx   Response Redirect  Pros - RESTful - It changes the address bar  the address can be used to record changes of state inbetween requests    Cons - Slow - There is an extra round-trip between the client and server   This can be expensive when there is substantial latency between the client and the server   Server Transfer  Pros - Quick   Cons - State lost -  If you re using Server Transfer to change the state of the application in response to post backs  if the page is then reloaded that state will be lost  as the address bar will be the same as it was on the first request

User · Answer

Response Redirect  tells the browser that the requested page can be found at a new location  The browser then initiates another request to the new page loading its contents in the browser  This results in two requests by the browser    Server Transfer  It transfers execution from the first page to the second page on the server  As far as the browser client is concerned  it made one request and the initial page is the one responding with content   The benefit of this approach is one less round trip to the server from the client browser  Also  any posted form variables and query string parameters are available to the second page as well

User · Answer

Transfer is entirely server-side   Client address bar stays constant   Some complexity about the transfer of context between requests   Flushing and restarting page handlers can be expensive so do your transfer early in the pipeline e g  in an HttpModule during BeginRequest   Read the MSDN docs carefully  and test and understand the new values of HttpContext Request - especially in Postback scenarios   We usually use Server Transfer for error scenarios   Redirect terminates the request with a 302 status and client-side roundtrip response with and internally eats an exception  minor server perf hit - depends how many you do a day   Client then navigates to new address   Browser address bar  amp  history updates etc   Client pays the cost of an extra roundtrip - cost varies depending on latency   In our business we redirect a lot we wrote our own module to avoid the exception cost

User · Answer

response redirect  and  server transfer  helps to transfer user from one page to other page while the page is executing  But the way they do this transfer   redirect is very different    In case you are visual guy and would like see demonstration rather than theory I would suggest to see the below facebook video which explains the difference in a more demonstrative way   https   www facebook com photo php v 762186150488997   The main difference between them is who does the transfer  In  response redirect  the transfer is done by the browser while in  server transfer  it   s done by the server  Let us try to understand this statement in a more detail manner   In  Server Transfer  following is the sequence of how transfer happens -  1 User sends a request to an ASP NET page  In the below figure the request is sent to  WebForm1  and we would like to navigate to  Webform2    2 Server starts executing  Webform1  and the life cycle of the page starts  But before the complete life cycle of the page is completed    Server transfer    happens to  WebForm2     3  Webform2  page object is created  full page life cycle is executed and output HTML response is then sent to the browser      While in  Response Redirect  following is the sequence of events for navigation -  1 Client  browser  sends a request to a  page  In the below figure the request is sent to  WebForm1  and we would like to navigate to  Webform2    2 Life cycle of  Webform1  starts executing  But in between of the life cycle  Response Redirect  happens   3 Now rather than server doing a redirect   he sends a HTTP 302 command to the browser  This command tells the browser that he has to initiate a GET request to  Webform2 aspx  page   4 Browser interprets the 302 command and sends a GET request for  Webform2 aspx      In other words  Server Transfer  is executed by the server while  Response Redirect  is executed by thr browser   Response Redirect  needs to two requests to do a redirect of the page   So when to use  Server Transfer  and when to use  Response Redirect     Use  Server Transfer  when you want to navigate pages which reside on the same server  use  Response Redirect  when you want to navigate between pages which resides on different server and domain     Below is a summary table of which chalks out differences and in which scenario to use

User · Answer

Response Redirect   will send you to a new page  update the address bar and add it to the Browser History   On your browser you can click back   Server Transfer   does not change the address bar  You cannot hit back   I use Server Transfer   when I don t want the user to see where I am going  Sometimes on a  loading  type page   Otherwise I ll always use Response Redirect

User · Answer

To be Short  Response Redirect simply tells the browser to visit another page  Server Transfer helps reduce server requests  keeps the URL the same and  with a little bug-bashing  allows you to transfer the query string and form variables   Something I found and agree with  source       Server Transfer is similar in that it sends the user to another page   with a statement such as Server Transfer  WebForm2 aspx    However    the statement has a number of distinct advantages and disadvantages       Firstly  transferring to another page using Server Transfer   conserves server resources  Instead of telling the browser to   redirect  it simply changes the  focus  on the Web server and   transfers the request  This means you don t get quite as many HTTP   requests coming through  which therefore eases the pressure on your   Web server and makes your applications run faster       But watch out  because the  transfer  process can work on only those   sites running on the server  you can t use Server Transfer to send   the user to an external site  Only Response Redirect can do that       Secondly  Server Transfer maintains the original URL in the browser    This can really help streamline data entry techniques  although it may   make for confusion when debugging       That s not all  The Server Transfer method also has a second   parameter    preserveForm   If you set this to True  using a statement   such as Server Transfer  WebForm2 aspx   True   the existing query   string and any form variables will still be available to the page you   are transferring to       For example  if your WebForm1 aspx has a TextBox control called   TextBox1 and you transferred to WebForm2 aspx with the preserveForm   parameter set to True  you d be able to retrieve the value of the   original page TextBox control by referencing   Request Form  TextBox1

User · Answer

Response Redirect is more costly since it adds an extra trip to the server to figure out where to go     Server Transfer is more efficient however it can be a little mis-leading to the user since the Url doesn t physically change   In my experience  the difference in performance has not been significant enough to use the latter approach

User · Answer

Response Redirect Response Redirect   will send you to a new page  update the address bar and add it to the Browser History  On your browser you can click back  It redirects the request to some plain HTML pages on our server or to some other web server  It causes additional roundtrips to the server on each request  It doesn   t preserve Query String and Form Variables from the original request  It enables to see the new redirected URL where it is redirected in the browser  and be able to bookmark it if it   s necessary   Response  Redirect simply sends a message down to the  HTTP 302  browser   Server Transfer Server Transfer   does not change the address bar  we cannot hit back One should use Server Transfer   when he she doesn   t want the user to see where he is going  Sometime on a  loading  type page  It transfers current page request to another  aspx page on the same server  It preserves server resources and avoids the unnecessary roundtrips to the server  It preserves Query String and Form Variables  optionally   It doesn   t show the real URL where it redirects the request in the users Web Browser  Server Transfer happens without the browser knowing anything  the browser request a page  but the server returns the content of another

User · Answer

Response Redirect redirects page to another page after first page arrives to client  So client knows the redirection   Server Transfer quits current execution of the page  Client does not know the redirection  It allows you to transfer the query string and form variables   So it depends to your needs to choose which is better

User · Answer

The beauty of Server Transfer is what you can do with it   TextBox myTxt    TextBox this Page PreviousPage FindControl  TextBoxID      You can get anything from your previous page using the above method as long as you use Server Transfer but not Response Redirect

User · Answer

Server Transfer doesn t change the URL in the client browser  so effectively the browser does not know you changed to another server-side handler  Response Redirect tells the browser to move to a different page  so the url in the titlebar changes   Server Transfer is slightly faster since it avoids one roundtrip to the server  but the non-change of url may be either good or bad for you  depending on what you re trying to do

User · Answer

There are many differences as specified above  Apart from above all  there is one more difference  Response Redirect   can be used to redirect user to any page which is not part of the application but Server Transfer   can only be used to redirect user within the application     This will work  Response Redirect  http   www google com       This will not work  Server Transfer  http   www google com

User · Answer

Response Redirect   will send you to a new page  update the address bar and add it to the Browser History   On your browser you can click back   Server Transfer   does not change the address bar  You cannot hit back   I use Server Transfer   when I don t want the user to see where I am going  Sometimes on a  loading  type page   Otherwise I ll always use Response Redirect

User · Answer

Response Redirect is more costly since it adds an extra trip to the server to figure out where to go     Server Transfer is more efficient however it can be a little mis-leading to the user since the Url doesn t physically change   In my experience  the difference in performance has not been significant enough to use the latter approach

User · Answer

Response Redirect   will send you to a new page  update the address bar and add it to the Browser History   On your browser you can click back   Server Transfer   does not change the address bar  You cannot hit back   I use Server Transfer   when I don t want the user to see where I am going  Sometimes on a  loading  type page   Otherwise I ll always use Response Redirect

User · Answer

Just more details about Transfer    it s actually is Server Execute     Response End    its source code is below  from Mono  net 4 0   public void Transfer  string path  bool preserveForm        this Execute  path  null  preserveForm  true       this context Response End        and for Execute    what it is to run is the handler of the given path  see  ASP NET does not verify that the current user is authorized to view the resource delivered by the Execute method  Although the ASP NET authorization and authentication logic runs before the original resource handler is called  ASP NET directly calls the handler indicated by the Execute method and does not rerun authentication and authorization logic for the new resource  If your application s security policy requires clients to have appropriate authorization to access the resource  the application should force reauthorization or provide a custom access-control mechanism  You can force reauthorization by using the Redirect method instead of the Execute method  Redirect performs a client-side redirect in which the browser requests the new resource  Because this redirect is a new request entering the system  it is subjected to all the authentication and authorization logic of both Internet Information Services  IIS  and ASP NET security policy  -from MSDN

User · Answer

Response Redirect is more costly since it adds an extra trip to the server to figure out where to go     Server Transfer is more efficient however it can be a little mis-leading to the user since the Url doesn t physically change   In my experience  the difference in performance has not been significant enough to use the latter approach

User · Answer

Server Transfer doesn t change the URL in the client browser  so effectively the browser does not know you changed to another server-side handler  Response Redirect tells the browser to move to a different page  so the url in the titlebar changes   Server Transfer is slightly faster since it avoids one roundtrip to the server  but the non-change of url may be either good or bad for you  depending on what you re trying to do

User · Answer

There are many differences as specified above  Apart from above all  there is one more difference  Response Redirect   can be used to redirect user to any page which is not part of the application but Server Transfer   can only be used to redirect user within the application     This will work  Response Redirect  http   www google com       This will not work  Server Transfer  http   www google com

User · Answer

To be Short  Response Redirect simply tells the browser to visit another page  Server Transfer helps reduce server requests  keeps the URL the same and  with a little bug-bashing  allows you to transfer the query string and form variables   Something I found and agree with  source       Server Transfer is similar in that it sends the user to another page   with a statement such as Server Transfer  WebForm2 aspx    However    the statement has a number of distinct advantages and disadvantages       Firstly  transferring to another page using Server Transfer   conserves server resources  Instead of telling the browser to   redirect  it simply changes the  focus  on the Web server and   transfers the request  This means you don t get quite as many HTTP   requests coming through  which therefore eases the pressure on your   Web server and makes your applications run faster       But watch out  because the  transfer  process can work on only those   sites running on the server  you can t use Server Transfer to send   the user to an external site  Only Response Redirect can do that       Secondly  Server Transfer maintains the original URL in the browser    This can really help streamline data entry techniques  although it may   make for confusion when debugging       That s not all  The Server Transfer method also has a second   parameter    preserveForm   If you set this to True  using a statement   such as Server Transfer  WebForm2 aspx   True   the existing query   string and any form variables will still be available to the page you   are transferring to       For example  if your WebForm1 aspx has a TextBox control called   TextBox1 and you transferred to WebForm2 aspx with the preserveForm   parameter set to True  you d be able to retrieve the value of the   original page TextBox control by referencing   Request Form  TextBox1

User · Answer

Response Redirect  tells the browser that the requested page can be found at a new location  The browser then initiates another request to the new page loading its contents in the browser  This results in two requests by the browser    Server Transfer  It transfers execution from the first page to the second page on the server  As far as the browser client is concerned  it made one request and the initial page is the one responding with content   The benefit of this approach is one less round trip to the server from the client browser  Also  any posted form variables and query string parameters are available to the second page as well

User · Answer

In addition to ScarletGarden s comment  you also need to consider the impact of search engines and your redirect  Has this page moved permanently  Temporarily  It makes a difference   see  Response Redirect vs   301 Moved Permanently       We ve all used Response Redirect at   one time or another  It s the quick   and easy way to get visitors pointed   in the right direction if they somehow   end up in the wrong place  But did you   know that Response Redirect sends an   HTTP response status code of  302   Found  when you might really want to   send  301 Moved Permanently         The distinction seems small  but in   certain cases it can actually make a   big difference  For example  if you   use a  301 Moved Permanently  response   code  most search engines will remove   the outdated link from their index and   replace it with the new one  If you   use  302 Found   they ll continue   returning to the old page

User · Answer

In addition to ScarletGarden s comment  you also need to consider the impact of search engines and your redirect  Has this page moved permanently  Temporarily  It makes a difference   see  Response Redirect vs   301 Moved Permanently       We ve all used Response Redirect at   one time or another  It s the quick   and easy way to get visitors pointed   in the right direction if they somehow   end up in the wrong place  But did you   know that Response Redirect sends an   HTTP response status code of  302   Found  when you might really want to   send  301 Moved Permanently         The distinction seems small  but in   certain cases it can actually make a   big difference  For example  if you   use a  301 Moved Permanently  response   code  most search engines will remove   the outdated link from their index and   replace it with the new one  If you   use  302 Found   they ll continue   returning to the old page

User · Answer

Transfer is entirely server-side   Client address bar stays constant   Some complexity about the transfer of context between requests   Flushing and restarting page handlers can be expensive so do your transfer early in the pipeline e g  in an HttpModule during BeginRequest   Read the MSDN docs carefully  and test and understand the new values of HttpContext Request - especially in Postback scenarios   We usually use Server Transfer for error scenarios   Redirect terminates the request with a 302 status and client-side roundtrip response with and internally eats an exception  minor server perf hit - depends how many you do a day   Client then navigates to new address   Browser address bar  amp  history updates etc   Client pays the cost of an extra roundtrip - cost varies depending on latency   In our business we redirect a lot we wrote our own module to avoid the exception cost

User · Answer

Response Redirect   should be used when    we want to redirect the request to some plain HTML pages on our server or to some other web server we don t care about causing additional roundtrips to the server on each request we do not need to preserve Query String and Form Variables from the original request we want our users to be able to see the new redirected URL where he is redirected in his browser  and be able to bookmark it if its necessary    Server Transfer   should be used when    we want to transfer current page request to another  aspx page on the same server we want to preserve server resources and avoid the unnecessary roundtrips to the server we want to preserve Query String and Form Variables  optionally  we don t need to show the real URL where we redirected the request in the users Web Browser

User · Answer

Response Redirect   should be used when    we want to redirect the request to some plain HTML pages on our server or to some other web server we don t care about causing additional roundtrips to the server on each request we do not need to preserve Query String and Form Variables from the original request we want our users to be able to see the new redirected URL where he is redirected in his browser  and be able to bookmark it if its necessary    Server Transfer   should be used when    we want to transfer current page request to another  aspx page on the same server we want to preserve server resources and avoid the unnecessary roundtrips to the server we want to preserve Query String and Form Variables  optionally  we don t need to show the real URL where we redirected the request in the users Web Browser

User · Answer

Response Redirect   will send you to a new page  update the address bar and add it to the Browser History   On your browser you can click back   Server Transfer   does not change the address bar  You cannot hit back   I use Server Transfer   when I don t want the user to see where I am going  Sometimes on a  loading  type page   Otherwise I ll always use Response Redirect

User · Answer

Response Redirect is more costly since it adds an extra trip to the server to figure out where to go     Server Transfer is more efficient however it can be a little mis-leading to the user since the Url doesn t physically change   In my experience  the difference in performance has not been significant enough to use the latter approach

User · Answer

Response Redirect Response Redirect   will send you to a new page  update the address bar and add it to the Browser History  On your browser you can click back  It redirects the request to some plain HTML pages on our server or to some other web server  It causes additional roundtrips to the server on each request  It doesn   t preserve Query String and Form Variables from the original request  It enables to see the new redirected URL where it is redirected in the browser  and be able to bookmark it if it   s necessary   Response  Redirect simply sends a message down to the  HTTP 302  browser   Server Transfer Server Transfer   does not change the address bar  we cannot hit back One should use Server Transfer   when he she doesn   t want the user to see where he is going  Sometime on a  loading  type page  It transfers current page request to another  aspx page on the same server  It preserves server resources and avoids the unnecessary roundtrips to the server  It preserves Query String and Form Variables  optionally   It doesn   t show the real URL where it redirects the request in the users Web Browser  Server Transfer happens without the browser knowing anything  the browser request a page  but the server returns the content of another

User · Answer

Response Redirect redirects page to another page after first page arrives to client  So client knows the redirection   Server Transfer quits current execution of the page  Client does not know the redirection  It allows you to transfer the query string and form variables   So it depends to your needs to choose which is better

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