Configure a Rewrite Action

Warning

The Pattern function in a rewrite action is deprecated from Citrix ADC 12.0 build 56.20 onwards and as an alternative, Citrix recommends you to use the Search rewrite action parameter.

A rewrite action indicates changes made to a request or response prior to sending it to a server or client.

Expressions define the following:

• Rewrite action type.

• Location of the rewrite action.

• Rewrite action configuration type.

For Example, a DELETE action only uses a target expression. A REPLACE action uses a target expression and an expression to configure the replacement text.

After enabling the rewrite feature, you need to configure one or more actions unless a built-in rewrite action is sufficient. All of the built-in actions have names beginning with the string ns_cvpn, followed by a string of letters and underscore characters. Built-in actions perform useful and complex tasks such as decoding parts of a clientless VPN request or response or modifying JavaScript or XML data. The built-in actions can be viewed, enabled, and disabled, but cannot be modified or deleted.

Note:

Action types that can be used only for HTTP rewrite are identified in theRewrite Action Typecolumn.

For more information, seeType parameter.

Create a rewrite action by using the command line interface

At the command prompt, type the following commands to create a rewrite action and verify the configuration:

• 添加重写操作<名称> <类型> <目标>(<字符串BuilderExpr>] [-search ] [refineSearch ] [-comment]
• show rewrite action

For more information, see theRewrite Action Types and their Argumentstable.

The rewrite feature has the following built-in actions:

• NOREWRITE-Sends the request or response to the user without rewriting it.

• RESET - Resets the connection and notifies the user’s browser, so that the user can resend the request.

• DROP - Drops the connection without sending a response to the user.

One of the following flow types is implicitly associated with every action:

• Request - Action applies to the request.

• Response - Action applies to the response.

• Neutral - Action applies to both requests and responses.

Name

Name for the user-defined rewrite action. Must begin with a letter, number, or the underscore character (_), and must contain only letters, numbers, and the hyphen (-), period (.) hash (#), space ( ), at (@), equals (=), colon (:), and underscore characters. Can be changed after the rewrite policy is added.

Type parameter

TheTypeparameter shows the type of user-defined rewrite action.

Following are the values of theTypeparameter:

• REPLACE . Replaces the string with the string-builder expression.

Example:

> add rewrite action replace_http_act replace http.res.body(100) '"new_replaced_data"' Done > sh rewrite action replace_http_act Name: replace_http_act Operation: replace Target:http.res.body(100) Value:"new_replaced_data" Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done 

• REPLACE_ALL -(pattern|search) . In the request or response specified by, replaces all occurrences of the string defined bywith the string defined by. You can use a PCRE-format pattern or the search facility to find the strings to be replaced.

Example:

>添加政策patset pat_list_2 >绑定完成政策patset pat_list_2 "www.abc.com" Done > bind policy patset pat_list_2 "www.def.com" Done > add rewrite action refineSearch_act_31 replace_all "HTTP.RES.BODY(100000)" "\"https://\""-search "patset(\"pat_list_2\")" -refineSearch "EXTEND(7,0).REGEX_SELECT(re#http://#)" Done > sh rewrite action refineSearch_act_31 Name: refineSearch_act_31 Operation: replace_all Target:HTTP.RES.BODY(100000) Refine Search:EXTEND(7,0).REGEX_SELECT(re#http://#) Value:"https://" Search: patset("pat_list_2") Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done 

• REPLACE_HTTP_RES . Replaces the complete HTTP response with the string defined by the string-builder expression.

Example:

> add rewrite action replace_http_res_act replace_http_res '"HTTP/1.1 200 OK\r\n\r\nSending from ADC"' Done > sh rewrite action replace_http_res_act Name: replace_http_res_act Operation: replace_http_res Target:"HTTP/1.1 200 OK Sending from ADC" Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done 

• REPLACE_SIP_RES . Replaces the complete SIP response with the string specified by.

Example:

> add rewrite action replace_sip_res_act replace_sip_res '"HTTP/1.1 200 OK\r\n\r\nSending from ADC"' Done > sh rewrite action replace_sip_res_act Name: replace_sip_res_act Operation: replace_sip_res Target:"HTTP/1.1 200 OK Sending from ADC" Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done 

• INSERT_HTTP_HEADER . Inserts the HTTP header specified by and header contents specified by .

Example:

> add rewrite action ins_cip_header insert_http_header "CIP" "CLIENT.IP.SRC" Done > sh rewrite action ins_cip_header Name: ins_cip_header Operation: insert_http_header Target:CIP Value:CLIENT.IP.SRC Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done 

• DELETE_HTTP_HEADER . Deletes the HTTP header specified by

Example:

>添加del_true_client_ip_header del重写操作ete_http_header "True-Client-IP" Done > sh rewrite action del_true_client_ip_header Name: del_true_client_ip_header Operation: delete_http_header Target:True-Client-IP Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done 

• CORRUPT_HTTP_HEADER . Replaces the header name of all occurrences of the HTTP header specified bywith a corrupted name, so that it will not be recognized by the receiver Example: MY_HEADER is changed to MHEY_ADER.

Example:

> add rewrite action corrupt_content_length_hdr corrupt_http_header "Content-Length" Done > sh rewrite action corrupt_content_length_hdr Name: corrupt_content_length_hdr Operation: corrupt_http_header Target:Content-Length Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done 

• INSERT_BEFORE . Finds the string specified inand inserts the string inbefore it.

> add rewrite action insert_before_ex_act insert_before http.res.body(100) '"Add this string in the starting"' Done > sh rewrite action insert_before_ex_act Name: insert_before_ex_act Operation: insert_before Target:http.res.body(100) Value:"Add this string in the starting" Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done 

• INSERT_BEFORE_ALL -(pattern|search) . In the request or response specified by, locates all occurrences of the string specified inand inserts the string specified inbefore it. You can use a PCRE-format pattern or the search facility to find the strings.

Example:

> add policy patset pat Done > bind policy patset pat abcd Done > add rewrite action refineSearch_act_1 insert_before_all http.res.body(10) 'target.prefix(10) + "refineSearch_testing"' -search patset("pat") -refineSearch extend(10,10) Done > sh rewrite action refineSearch_act_1 Name: refineSearch_act_1 Operation: insert_before_all Target:http.res.body(10) Refine Search:extend(10,10) Value:target.prefix(10) + "refineSearch_testing" Search: patset("pat") Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done 

• INSERT_AFTER . Finds the string specified in , and inserts the string specified in after it. **Example**:

> add rewrite action insert_after_act insert_after http.req.body(100) '"add this string after 100 bytes"' Done > sh rewrite action insert_after_act Name: insert_after_act Operation: insert_after Target:http.req.body(100) Value:"add this string after 100 bytes" Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done 

• INSERT_AFTER_ALL -(pattern|search) . In the request or response specified by, locates all occurrences of the string specified byand inserts the string specified byafter each. You can use a PCRE-format pattern or the search facility to find the strings.

Example:

> add rewrite action refineSearch_act_2 insert_after_all http.res.body(100) '"refineSearch_testing"' -search text("abc") -refineSearch extend(0, 10) Done > sh rewrite action refineSearch_act_2 Name: refineSearch_act_2 Operation: insert_after_all Target:http.res.body(100) Refine Search:extend(0, 10) Value:"refineSearch_testing" Search: text("abc") Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done 

• DELETE . Finds and deletes the specified target.

Example:

> add rewrite action delete_ex_act delete http.req.header("HDR") Done > sh rewrite action delete_ex_act Name: delete_ex_act Operation: delete Target:http.req.header("HDR") Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done 

• DELETE_ALL -(pattern|search) . In the request or response specified by, locates and deletes all occurrences of the string specified by. You can use a PCRE-format pattern or the search facility to find the strings.

Example:

>add rewrite action refineSearch_act_4 delete_all "HTTP.RES.BODY(50000)" -search text("Windows Desktops") -refineSearch "EXTEND(40,40).REGEX_SELECT(re#\\s`*`.`*`\\s`*`<\\/AppData>#)" Done > show REWRITE action refineSearch_act_4 Name: refineSearch_act_4 Operation: delete_all Target:HTTP.RES.BODY(50000) Refine Search:EXTEND(40,40).REGEX_SELECT(re#\s`*`.`*`\s`*`<\/AppData>#) Search: text("Windows Desktops") Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done 

• REPLACE_DIAMETER_HEADER_FIELD . In the request or responses modify the header field specified by. UseDiameter.req.flags.SET()orDiameter.req.flags.UNSETasstringbuilderexpressionto set or unset flags.

Example:

> add rewrite action replace_diameter_field_ex_act replace_diameter_header_field diameter.req.flags diameter.req.flags.set(PROXIABLE) Done > sh rewrite action replace_diameter_field_ex_act Name: replace_diameter_field_ex_act Operation: replace_diameter_header_field Target:diameter.req.flags Value:diameter.req.flags.set(PROXIABLE) Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done 

• REPLACE_DNS_HEADER_FIELD . In the request or response modifies the header field specified by.

Example:

> add rewrite action replace_dns_hdr_act replace_dns_header_field dns.req.header.flags.set(AA) Done > sh rewrite action replace_dns_hdr_act Name: replace_dns_hdr_act Operation: replace_dns_header_field Target:dns.req.header.flags.set(AA) Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done 

• REPLACE_DNS_ANSWER_SECTION . Replace the DNS answer section in the response. This is currently applicable for A and AAAA records only. UseDNS.NEW_RRSET_AandNS.NEW_RRSET_AAAAexpressions to configure the new answer section.

Example:

> add rewrite action replace_dns_ans_act replace_dns_answer_section DNS.NEW_RRSET_A("1.1.1.1", 10) Done > sh rewrite action replace_dns_ans_act Name: replace_dns_ans_act Operation: replace_dns_answer_section Target:DNS.NEW_RRSET_A("1.1.1.1", 10) Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done 

• CLIENTLESS_VPN_DECODE. Decodes the pattern specified by target In clientless VPN format.

Example:

> add rewrite action cvpn_decode_act_1 clientless_vpn_decode http.req.body(100) Done > sh rewrite action cvpn_decode_act_1 Name: cvpn_decode_act_1 Operation: clientless_vpn_decode Target:http.req.body(100) Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done 

• CLIENTLESS_VPN_DECODE_ALL-search. Decodes ALL the patterns specified by search parameter In clientless VPN format.

Example:

> add rewrite action act1 clientless_vpn_decode_all http.req.body(100) -search text("abcd") Done > sh rewrite action act1 Name: act1 Operation: clientless_vpn_decode_all Target:http.req.body(100) Search: text("abcd") Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done 

• CLIENTLESS_VPN_ENCODE. Encodes the pattern specified by target in clientless VPN format.

Example:

> add rewrite action cvpn_encode_act_1 clientless_vpn_encode http.req.body(100) Done > sh rewrite action cvpn_encode_act_1 Name: cvpn_encode_act_1 Operation: clientless_vpn_encode Target:http.req.body(100) Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done 

• CLIENTLESS_VPN_ENCODE_ALL-search. Encodes ALL the patterns specified search parameter in clientless VPN format.

Example:

> add rewrite action act2 clientless_vpn_encode_all http.req.body(100) -search text("abcd") Done > sh rewrite action act2 Name: act1 Operation: clientless_vpn_encode_all Target:http.req.body(100) Search: text("abcd") Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done 

• CORRUPT_SIP_HEADER. Replaces the header name of all occurrences of the SIP header specified bywith a corrupted name, so that the receiver doesn’t recognize it.

Example:

> add rewrite action corrupt_sip_hdr_act corrupt_sip_header SIP_HDR Done > sh rewrite action corrupt_sip_hdr_act Name: corrupt_sip_hdr_act Operation: corrupt_sip_header Target:SIP_HDR Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done 

• INSERT_SIP_HEADER . Inserts the SIP header specified byand header contents specified by.

Example:

> add rewrite action insert_sip_hdr_act insert_sip_header SIP_HDR '"inserting_sip_header"' Done >sh rewrite action insert_sip_hdr_act Name: insert_sip_hdr_act Operation: insert_sip_header Target:SIP_HDR Value:"inserting_sip_header" Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done 

• DELETE_SIP_HEADER. Deletes the SIP header specified by

Example:

> add rewrite action delete_sip_hdr delete_sip_header SIP_HDR Done > sh rewrite action delete_sip_hdr Name: delete_sip_hdr Operation: delete_sip_header Target:SIP_HDR Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done 

Target parameter

The Target parameter Is an expression that specifies which part of the request or response to rewrite.

StringBuilderExpr

The StringBuilderExpr Is an expression that specifies the content that Is to be Inserted into the request or response at the specified location. This expression replaces a specified string.

Example 1. Inserting an HTTP Header With the Client IP:

> add rewrite action insertact INSERT_HTTP_HEADER "client-IP" CLIENT.IP.SRC Done > show rewrite action insertact Name: insertact Operation: insert_http_header Target:Client-IP Value:CLIENT.IP.SRC BypassSafetyCheck : NO Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done 

Example 2. Replacing Strings in a TCP Payload (TCP Rewrite):

> add rewrite action client_tcp_payload_replace_all REPLACE_ALL 'client.tcp.payload(1000)' '"new-string"' -search text("old-string") Done > show rewrite action client_tcp_payload_replace_all Name: client_tcp_payload_replace_all Operation: replace_all Target:client.tcp.payload(1000) Value:"new-string" Search: text("old-string") BypassSafetyCheck : NO Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done > 

Search a part of the request or response to rewrite

The Search functionality helps to find all the Instances of the required pattern in the request or response.

The Search functionality is required to be used in the following Action types:

• INSERT_BEFORE_ALL
• INSERT_AFTER_ALL
• REPLACE_ALL
• DELETE_ALL
• CLIENTLESS_VPN_ENCODE_ALL
• CLIENTLESS_VPN_DECODE_ALL

The Search functionality cannot be used with the following Action types:

• INSERT_HTTP_HEADER
• INSERT_BEFORE
• INSERT_AFTER
• REPLACE
• DELETE
• DELETE_HTTP_HEADER
• CORRUPT_HTTP_HEADER
• REPLACE_HTTP_RES
• CLIENTLESS_VPN_ENCODE
• CLIENTLESS_VPN_DECODE
• INSERT_SIP_HEADER
• DELETE_SIP_HEADER
• CORRUPT_SIP_HEADER
• REPLACE_DIAMETER_HEADER_FIELD
• REPLACE_DNS_ANSWER_SECTION
• REPLACE_DNS_HEADER_FIELD
• REPLACE_SIP_RES

The following Search types are supported:

• Text - a literal string Example: -search text (”hello”)
• Regular Expression - pattern that is used to match multiple strings in the request or response Example: -search regex(re~^hello*~)
• XPATH - An XPATH expression to search XML. Example: -search xpath(xp%/a/b%)
• JSON - An XPATH expression to search JSON. Example: -search xpath_json(xp%/a/b%) HTML - An XPATH expression to search HTML Example: -search xpath_html(xp%/html/body%) Patset - This searches all the patterns bound to the patset entity. Example: -search patset(“patset1”)
• Datset - This searches all the patterns bound to the datset entity. Example: -search dataset(“dataset1”)
• AVP - AVP number that is used to match multiple AVPs in a Diameter/Radius Message Example: -search avp(999)

Refine the search results

您可以使用spe的细化搜索功能cify the additional criteria to refine the search results. Refine Search functionality can only be used if Search functionality is used. The Refine search parameter always starts with the “extend(m,n)” operation, where ‘m’ specifies a number of bytes to the left of the search result and ‘n’ specifies a number of bytes to the right of the search result to extend the selected area.

If the configured rewrite action is:

> add rewrite action test_refine_search replace_all http.res.body(10) '”testing_refine_search”' -search text("abc") -refineSearch extend(1,1) And the HTTP response body is abcxxxx456. 

Then, the search parameter finds pattern “abc” and since the refineSearch parameter is also configured to check an extra 1 byte to the left and an extra one byte to the right of the matched pattern. The resultant replaced text is: abcx. So, the output of this action istesting_refine_searchxxx456.

Example 1:Using the Refine search functionality in INSERT_BEFORE_ALL action type.

> add policy patset pat Done > bind policy patset pat abcd Done > add rewrite action refineSearch_act_1 insert_before_all http.res.body(10) 'target.prefix(10) + "refineSearch_testing"' -search patset("pat") -refineSearch extend(10,10) Done > sh rewrite action refineSearch_act_1 Name: refineSearch_act_1 Operation: insert_before_all Target:http.res.body(10) Refine Search:extend(10,10) Value:target.prefix(10) + "refineSearch_testing" Search: patset("pat") Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done 

Example 2: Using the Refine search functionality in INSERT_AFTER_ALL action type.

> add rewrite action refineSearch_act_2 insert_after_all http.res.body(100) '"refineSearch_testing"' -search text("abc") -refineSearch extend(0, 10) Done > sh rewrite action refineSearch_act_2 Name: refineSearch_act_2 Operation: insert_after_all Target:http.res.body(100) Refine Search:extend(0, 10) Value:"refineSearch_testing" Search: text("abc") Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done 

Example 3: Using the Refine search functionality in REPLACE_ALL action type.

>添加政策patset pat_list_2 >绑定完成政策patset pat_list_2 "www.abc.com" Done > bind policy patset pat_list_2 "www.def.com" Done > add rewrite action refineSearch_act_31 replace_all "HTTP.RES.BODY(100000)" "\"https://\"" -search "patset(\"pat_list_2\")" -refineSearch "EXTEND(7,0).REGEX_SELECT(re#http://#)" Done > sh rewrite action refineSearch_act_31 Name: refineSearch_act_31 Operation: replace_all Target:HTTP.RES.BODY(100000) Refine Search:EXTEND(7,0).REGEX_SELECT(re#http://#) Value:"https://" Search: patset("pat_list_2") Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done 

Example 4: Using the Refine search functionality in DELETE_ALL action type.

>add rewrite action refineSearch_act_4 delete_all "HTTP.RES.BODY(50000)" -search text("Windows Desktops") -refineSearch "EXTEND(40,40).REGEX_SELECT(re#\\s*.*\\s*<\\/AppData>#)" > show REWRITE action refineSearch_act_4 Name: refineSearch_act_4 Operation: delete_all Target:HTTP.RES.BODY(50000) Refine Search:EXTEND(40,40).REGEX_SELECT(re#\s*.*\s*<\/AppData>#) Search: text("Windows Desktops") Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done > 

示例5:我使用细化搜索功能n CLIENTLESS_VPN_ENCODE_ALL action type.

’’’

add rewrite action act2 clientless_vpn_encode_all http.req.body(100) -search text(“abcd”) Done sh rewrite action act2 Name: act1 Operation: clientless_vpn_encode_all Target:http.req.body(100) Search: text(“abcd”) Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done

’’’

Example 6: Using the Refine Search functionality in CLIENTLESS_VPN_DECODE_ALL action type.

> add rewrite action act1 clientless_vpn_decode_all http.req.body(100) -search text("abcd") Done > sh rewrite action act1 Name: act1 Operation: clientless_vpn_decode_all Target:http.req.body(100) Search: text("abcd") Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done > 

Modify an existing rewrite action by using the command line interface

At the command prompt, type the following commands to modify an existing rewrite action and verify the configuration:

• set rewrite action [-target] [-stringBuilderExpr] [-pattern | -search ] [-refineSearch] [-comment]
• show rewrite action

Example:

> set rewrite action insertact -target "Client-IP" Done > show rewrite action insertact Name: insertact Operation: insert_http_header Target:Client-IP Value:CLIENT.IP.SRC Hits: 0 Undef Hits: 0 Action Reference Count: 0 Done 

Remove a rewrite action by using the command line interface

At the command prompt, type the following commands to remove a rewrite action:

rm rewrite action

Example:

> rm rewrite action insertact Done 

Configure a rewrite action by using the configuration utility

1. Navigate toAppExpert > Rewrite > Actions.
2. In the details pane, do one of the following:
   • To create an action, clickAdd.
   • 修改一个现有的行动,选择行动,一个nd then clickEdit.
3. ClickCreateorOK. A message appears in the status bar, stating that the Action has been configured successfully.
4. Repeat steps 2 through 4 to create or modify as many rewrite actions as you want.
5. ClickClose.

Add an expression by using the Add Expression dialog box

1. In theCreate Rewrite ActionorConfigure Rewrite Actiondialog box, under the text area for the type argument you want to enter, clickAdd.

2. In theAdd Expressiondialog box, in the first list box choose the first term for your expression.

   • HTTP. The HTTP protocol. Choose this if you want to examine some aspect of the request that pertains to the HTTP protocol.
   • SYS. The protected Web sites. Choose this if you want to examine some aspect of the request that pertains to the recipient of the request.
   • CLIENT. The computer that sent the request. Choose this if you want to examine some aspect of the sender of the request.

When you make your choice, the rightmost list box lists appropriate terms for the next part of your expression.

1. In the second list box, choose the second term for your expression. The choices depend upon which choice you made in the previous step, and are appropriate to the context. After you make your second choice, the Help window below the Construct Expression window (which was blank) displays help describing the purpose and use of the term you just chose.

2. Continue choosing terms from the list boxes that appear to the right of the previous list box, or typing strings or numbers in the text boxes that appear to prompt you to enter a value, until your expression is finished. For more information about the PI expressions language and creating expressions for responder policies, see “Policies and Expressions.”

If you want to test the effect of a rewrite action when used on sample HTTP data, you can use the Rewrite Expression Evaluator.

Rewrite TCP payloads

Target expressions in actions for TCP rewrite must begin with one of the following expression prefixes:

• CLIENT.TCP.PAYLOAD.For rewriting TCP payloads in client requests. For example, CLIENT.TCP.PAYLOAD(10000).AFTER_STR(“string1”).
• SERVER.TCP.PAYLOAD.For rewriting TCP payloads in server responses. For example, SERVER.TCP.PAYLOAD(1000).B64DECODE.BETWEEN(“string1”,”string2”).

Evaluate a rewrite action by using the Rewrite Action Evaluator dialog box

1. In theRewrite Actionsdetails pane, select the rewrite action that you want to evaluate, and then clickEvaluate.

2. In the Rewrite Expression Evaluator dialog box, specify values for the following parameters. (An asterisk indicates a required parameter.)

   Rewrite Action—If the rewrite action you want to evaluate is not already selected, select it from the drop-down list. After you select a Rewrite action, the Details section displays the details of the selected Rewrite action. New—Select New to open the Create Rewrite Action dialog box and create a rewrite action. Modify—Select Modify to open the Configure Rewrite Action dialog box and modify the selected rewrite action. Flow Type—Specifies whether to test the selected rewrite action with HTTP Request data or HTTP Response data. The default is Request. If you want to test with Response data, select Response. HTTP Request/Response Data*—Provides a space for you to provide the HTTP data that the Rewrite Action Evaluator is used for testing. You can paste the data directly into the window, or click Sample to insert some sample HTTP headers. Show end-of-line—Specifies whether to show UNIX-style end-of-line characters (\n) at the end of each line of sample HTTP data. Sample—Inserts sample HTTP data into the HTTP Request/Response Data window. You can choose either GET or POST data. Browse—Opens a local browse window so that you can choose a file containing sample HTTP data from a local or network location. Clear—Clears the current sample HTTP data from the HTTP Request/Response Data window.

3. Click Evaluate. TheRewrite Action Evaluatorevaluates the effect of the Rewrite action on the sample data that you chose, and displays the results as modified by the selectedRewriteaction in theResultswindow. Additions and deletions are highlighted as indicated in the legend in the lower left-hand corner of the dialog box.

4. Continue evaluating Rewrite actions until you have determined that all of your actions have the effect that you wanted.

   • You can modify the selected rewrite action and test the modified version by clickingModifyto open theConfigure Rewrite Actiondialog box, making and saving your changes, and then clicking Evaluate again.
   • You can evaluate a different rewrite action using the same request or response data by selecting it from theRewrite Actiondrop-down list, and then clickingEvaluateagain.

5. ClickCloseto close theRewrite Expression Evaluatorand return to theRewrite Actionspane.

6. To delete a rewrite action, select the rewrite action you want to delete, then clickRemoveand, when prompted, confirm your choice by clickingOK.