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Modify XML POST request

David_T
Nimbostratus
Nimbostratus

Hi,

 

I need to change some values in an XML Post REQUEST to Sharepoint (search) as it embeds URL in the XML with https: and I need it to be http.

 

I was looking to use STREAM::EXPRESSION which I am successfully using for doing a similar replacement in the RESPONSE.

 

This is what I thought would work:

 

when HTTP_REQUEST {

  # Explicitly disable the stream profile for each client-side request so it doesn't stay

  #  enabled for subsequent HTTP requests on the same TCP connection.

  STREAM::disable

 

# The line below prevents the server from compressing its responses.

  HTTP::header remove "Accept-Encoding"

  # Apply stream profile against text responses from the application

if { [HTTP::method] eq "POST" } {

HTTP::collect

  set ispost 1

}

}

 

when HTTP_REQUEST_DATA {

  if { [HTTP::header value Content-Type] contains "text"} {

#replace https with http

STREAM::expression "@https://@http://@"

# enable the stream filter for this request only

STREAM::enable

}

//recalculate the content-length after the replacement

if { [info exists ispost] } {

HTTP::header insert Content-Length [HTTP::payload length]

}

}

 

But I am getting an HTTP 411 response from the backend (which I had thought recalculating the content-length header would fix).

 

Any pointers would be appreciated.

 

Regards,

David.

2 REPLIES 2

PeteWhite
F5 Employee
F5 Employee

Don't use HTTP::header insert - then you'll get two Content-Length headers. Just check that there is already one present and update it. If it is not present then insert it

 

if { [HTTP::header exists Content-Length] } { HTTP::header replace Content-Length $contentLength } else { HTTP::header insert Conent-Length $contentLength }

 

Thanks Peter.

 

After a lot of experimentation I came to the conclusion that using Stream for request processing just doesn't work - which may explain there are zilch examples I could find.

Anyway I achieved what I wanted with the below:

 

when HTTP_REQUEST { # Explicitly disable the stream profile for each client-side request so it doesn't stay # enabled for subsequent HTTP requests on the same TCP connection. STREAM::disable   # The line below prevents the server from compressing its responses. HTTP::header remove "Accept-Encoding" # Apply stream profile against text responses from the application if { [HTTP::header value Content-Type] contains "text"} { HTTP::collect [HTTP::header Content-Length] set clen [HTTP::header Content-Length] } }   when HTTP_REQUEST_DATA { regsub -all "https://mysite" [HTTP::payload] "http://mysite" newdata HTTP::payload replace 0 $clen $newdata HTTP::release }   when HTTP_RESPONSE { # Explicitly disable the stream profile for each server-side response so it doesn't stay # enabled for subsequent HTTP responses on the same TCP connection. STREAM::disable if { !([HTTP::header exists "Strict-Transport-Security"])} { HTTP::header insert "Strict-Transport-Security" "maxage=16070400; includeSubdomains" }   # Apply stream profile against text responses from the application if { [HTTP::header value Content-Type] contains "text"} { # Look for the http:// and replace it with https:// STREAM::expression {@http:@https:@ @//mysite/@//mysite.example/@} # Enable the stream profile for this response only STREAM::enable } }