Home > Articles > Operating Systems, Server > Solaris

Like this article? We recommend

Rewriting HTML Attributes

Although most needed HTML tag attributes are already added to the Rewrite HTML Attributes section of the gateway profile, there may be instances where new attributes are supported in HTML tags. For rules added in this profile section to be considered during translation, the MIME type for the content should be text/html and the attribute value must be a raw URL. If the attribute value contains JavaScript content instead, then the attribute name should be added to the Rewrite HTML Attributes Containing JavaScript section.

The following is an example:

<A TARGET="content" HREF="iim.jnlp" NAME="CHAT"
SRC="images/chat.gif" BORDER="0" ALT=" Chat"></A>

In this particular anchor example, there are two tags, A and IMG. The tag attributes are TARGET, HREF, NAME, onMouseOver, onMouseOut, ALIGN, SRC, and ALT. Only HREF, onMouseOver, onMouseOut, and SRC need to be considered for containing potential URLs. The HREF and SRC attributes have already been added to the Rewrite HTML Attributes section of the gateway profile. Their values are both raw URLs, so they will be rewritten correctly.

The two event attributes onMouseOver and onMouseOut have been added to the Rewrite HTML Attributes Containing JavaScript section out-of-box, so their values will attempt to be translated as URLs. This translation will be successful only if a wildcard rule has been added to the Rewrite JavaScript Variables in URLs section of the gateway profile at the SP3 Hot Patch 3 install level.


It is important to understand the role that the BASE tag plays in how documents are rewritten and what to expect in content that contains a BASE tag. The BASE tag is used by the browser for address completion of relative links. Instead of rewriting the BASE HREF attribute value and leaving the relative URLs alone, the rewriter comments out the BASE tag entirely and rewrites the relative URLs throughout the document by using the translated value of the BASE tag for address completion. The reason for this implementation is that multiple scraped channels can be displayed on the Portal Server desktop and that one uncommented BASE tag would affect any other Portal Server desktop content that might contain its own relative URLs.

Because the Portal Server desktop is essentially an HTML table after it is rendered, there is no way to have multiple BASE tags and have the relative URLs resolved correctly. Similarly, scraped pages that contain CSS content can adversely affect the entire Portal Server desktop if the CSS content contains generalized style definitions for basic HTML elements such as the BODY and TABLE tags.

One other limitation to be aware of is when content contains a BASE tag and an APPLET and/or OBJECT tag that does not contain a CODEBASE attribute. In this particular case, when the BASE tag is commented out, the browser will no longer be able to find the APPLET and/or OBJECT code and/or data because there will not be any prepended path information supplied. In this case, always be sure that a CODEBASE attribute is used for these, and similar tags, when a BASE tag is also used within the same document. The SP4 Hot Patch 1 release handles this case by inserting a CODEBASE attribute if one does not already exist when a BASE tag is present in the document HEAD element. Even though the BASE HREF value can be a fully qualified URL, which includes a resource name, it is recommended to end the HREF value with a directory name and a trailing slash.

The following is an example:

<BASE HREF="http://www.iplanet.com/docs/index.html">
<BASE HREF="http://www.iplanet.com/docs/">

The first instance is a valid BASE tag. The second instance will be sure to resolve relative URLs throughout the remainder of the document correctly. The SP4 Hot Patch 1 release addresses cases in which the BASE tag contains only the host and port information, but no path information, as in the following example:

<BASE HREF="http://www.iplanet.com.80">

Best Practices—HTML Programming for Use Through the Gateway

You should use the following best practices:

  • Always use CODEBASE attributes for tags that support them, as in the following example:

    <APPLET CODEBASE="http://www.iplanet.com/java/" 
  • End BASE HREF attribute URLs with a directory name or a directory name and a following slash, as in the following example:

    <BASE HREF="http://www.iplanet.com/docs/">
  • Avoid fractured HTML where attribute values or tag bodies might be defined on multiple lines, as in the following example:

    document.write("<A HREF=\"\n");
  • Try to maintain well-formed HTML where quotes match up and they are the same type.

    Avoid nested quotes where possible, and use consistency across tag definitions, as in the following example:

    document.write("<IMG SRC='" + theSrc + "' HEIGHT=80 


    Here the gateway will blindly rewrite the SRC attribute without knowing the value of theSrc variable. There may be a fix for this by the time you read this guide, so check with Sun ONE support if you experience this problem and are unable to code around it.

  • Specify URLs with prepended path information whenever possible.

    Having prepended path information makes it easier for the gateway to figure out address completion. The following is an example:

    <IMG SRC="../../images/button.gif">
  • Do not use upper case or mixed case protocol identifiers in your URLs, as in the following:

    <A HREF="HTTP://content-server.iplanet.com">
  • Do not attempt to mimic the rewriter behavior by adding the gateway name to the URL prior to passing the content through the gateway.

  • Try to avoid setting attribute values to null if the attribute name has been added to the Rewrite HTML Attributes list. Prior to SP3 Hot Patch 3, a value of "" would still be rewritten.

    The following is an example of what to avoid prior to SP3 Hot Patch 3:

    <FRAMESET cols="20%, 80%">
     <FRAMESET rows="100, 200">
       <FRAME src="">
       <FRAME src="test-txt2.html">
     <FRAME src="test-txt3.html">


    This is usually done so that JavaScript write methods can later be called to create the actual frame page. If this SRC attribute is rewritten and accessed using the Netscape Navigator browser, a directory listing may be presented, depending on the web server configuration, but the write methods will still execute. With the Internet Explorer browser, if the directory listing is turned off on the web server, an error redirection occurs in the browser, and the JavaScript write methods will no longer work. SP3 Hot Patch 3 fixed this inconsistency by simply not rewriting the null SRC attribute value. If white space occurs between the quotes, it will not be considered a null attribute value any longer and will be rewritten. So, it is important to ensure that the quotes occur directly next to one another to prevent unwanted rewriting from occurring.

  • Avoid using the STYLE attribute with a background URL in HTML tags, as in the following example:

    <BODY STYLE="background-image:url(../../img/background.jpg);
  • Avoid nesting tags of the same type, which may contain content requiring translation, as in the following example:

    <SPAN STYLE="color:blue; font-weight:bold; font-style:italic">
     Inside SPAN tag:
     <BR CLEAR="ALL">
     <A HREF="../../img/after.jpg">
      <IMG SRC="../../img/after.jpg">
    <BR CLEAR="ALL">
    Outside SPAN tag:<BR>
    <A HREF="../../img/after.jpg">
     <IMG SRC="../../img/after.jpg">


    Prior to SP3 Hot Patch 3, the rewriter would ignore the content between nested SPAN tags.

  • Avoid using a SCRIPT tag with a language attribute other than JavaScript, as in the following example:

    <SCRIPT Language="VBScript">


    There is currently no functionality in the rewriter to handle any scripted languages other than JavaScript.

  • Do not pass gzipped HTML through the gateway to be displayed by the client.

    This HTML could contain URLs that will not be rewritten because the content is in a compressed format when it passes through the gateway.

InformIT Promotional Mailings & Special Offers

I would like to receive exclusive offers and hear about products from InformIT and its family of brands. I can unsubscribe at any time.


Pearson Education, Inc., 221 River Street, Hoboken, New Jersey 07030, (Pearson) presents this site to provide information about products and services that can be purchased through this site.

This privacy notice provides an overview of our commitment to privacy and describes how we collect, protect, use and share personal information collected through this site. Please note that other Pearson websites and online products and services have their own separate privacy policies.

Collection and Use of Information

To conduct business and deliver products and services, Pearson collects and uses personal information in several ways in connection with this site, including:

Questions and Inquiries

For inquiries and questions, we collect the inquiry or question, together with name, contact details (email address, phone number and mailing address) and any other additional information voluntarily submitted to us through a Contact Us form or an email. We use this information to address the inquiry and respond to the question.

Online Store

For orders and purchases placed through our online store on this site, we collect order details, name, institution name and address (if applicable), email address, phone number, shipping and billing addresses, credit/debit card information, shipping options and any instructions. We use this information to complete transactions, fulfill orders, communicate with individuals placing orders or visiting the online store, and for related purposes.


Pearson may offer opportunities to provide feedback or participate in surveys, including surveys evaluating Pearson products, services or sites. Participation is voluntary. Pearson collects information requested in the survey questions and uses the information to evaluate, support, maintain and improve products, services or sites, develop new products and services, conduct educational research and for other purposes specified in the survey.

Contests and Drawings

Occasionally, we may sponsor a contest or drawing. Participation is optional. Pearson collects name, contact information and other information specified on the entry form for the contest or drawing to conduct the contest or drawing. Pearson may collect additional personal information from the winners of a contest or drawing in order to award the prize and for tax reporting purposes, as required by law.


If you have elected to receive email newsletters or promotional mailings and special offers but want to unsubscribe, simply email information@informit.com.

Service Announcements

On rare occasions it is necessary to send out a strictly service related announcement. For instance, if our service is temporarily suspended for maintenance we might send users an email. Generally, users may not opt-out of these communications, though they can deactivate their account information. However, these communications are not promotional in nature.

Customer Service

We communicate with users on a regular basis to provide requested services and in regard to issues relating to their account we reply via email or phone in accordance with the users' wishes when a user submits their information through our Contact Us form.

Other Collection and Use of Information

Application and System Logs

Pearson automatically collects log data to help ensure the delivery, availability and security of this site. Log data may include technical information about how a user or visitor connected to this site, such as browser type, type of computer/device, operating system, internet service provider and IP address. We use this information for support purposes and to monitor the health of the site, identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents and appropriately scale computing resources.

Web Analytics

Pearson may use third party web trend analytical services, including Google Analytics, to collect visitor information, such as IP addresses, browser types, referring pages, pages visited and time spent on a particular site. While these analytical services collect and report information on an anonymous basis, they may use cookies to gather web trend information. The information gathered may enable Pearson (but not the third party web trend services) to link information with application and system log data. Pearson uses this information for system administration and to identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents, appropriately scale computing resources and otherwise support and deliver this site and its services.

Cookies and Related Technologies

This site uses cookies and similar technologies to personalize content, measure traffic patterns, control security, track use and access of information on this site, and provide interest-based messages and advertising. Users can manage and block the use of cookies through their browser. Disabling or blocking certain cookies may limit the functionality of this site.

Do Not Track

This site currently does not respond to Do Not Track signals.


Pearson uses appropriate physical, administrative and technical security measures to protect personal information from unauthorized access, use and disclosure.


This site is not directed to children under the age of 13.


Pearson may send or direct marketing communications to users, provided that

  • Pearson will not use personal information collected or processed as a K-12 school service provider for the purpose of directed or targeted advertising.
  • Such marketing is consistent with applicable law and Pearson's legal obligations.
  • Pearson will not knowingly direct or send marketing communications to an individual who has expressed a preference not to receive marketing.
  • Where required by applicable law, express or implied consent to marketing exists and has not been withdrawn.

Pearson may provide personal information to a third party service provider on a restricted basis to provide marketing solely on behalf of Pearson or an affiliate or customer for whom Pearson is a service provider. Marketing preferences may be changed at any time.

Correcting/Updating Personal Information

If a user's personally identifiable information changes (such as your postal address or email address), we provide a way to correct or update that user's personal data provided to us. This can be done on the Account page. If a user no longer desires our service and desires to delete his or her account, please contact us at customer-service@informit.com and we will process the deletion of a user's account.


Users can always make an informed choice as to whether they should proceed with certain services offered by InformIT. If you choose to remove yourself from our mailing list(s) simply visit the following page and uncheck any communication you no longer want to receive: www.informit.com/u.aspx.

Sale of Personal Information

Pearson does not rent or sell personal information in exchange for any payment of money.

While Pearson does not sell personal information, as defined in Nevada law, Nevada residents may email a request for no sale of their personal information to NevadaDesignatedRequest@pearson.com.

Supplemental Privacy Statement for California Residents

California residents should read our Supplemental privacy statement for California residents in conjunction with this Privacy Notice. The Supplemental privacy statement for California residents explains Pearson's commitment to comply with California law and applies to personal information of California residents collected in connection with this site and the Services.

Sharing and Disclosure

Pearson may disclose personal information, as follows:

  • As required by law.
  • With the consent of the individual (or their parent, if the individual is a minor)
  • In response to a subpoena, court order or legal process, to the extent permitted or required by law
  • To protect the security and safety of individuals, data, assets and systems, consistent with applicable law
  • In connection the sale, joint venture or other transfer of some or all of its company or assets, subject to the provisions of this Privacy Notice
  • To investigate or address actual or suspected fraud or other illegal activities
  • To exercise its legal rights, including enforcement of the Terms of Use for this site or another contract
  • To affiliated Pearson companies and other companies and organizations who perform work for Pearson and are obligated to protect the privacy of personal information consistent with this Privacy Notice
  • To a school, organization, company or government agency, where Pearson collects or processes the personal information in a school setting or on behalf of such organization, company or government agency.


This web site contains links to other sites. Please be aware that we are not responsible for the privacy practices of such other sites. We encourage our users to be aware when they leave our site and to read the privacy statements of each and every web site that collects Personal Information. This privacy statement applies solely to information collected by this web site.

Requests and Contact

Please contact us about this Privacy Notice or if you have any requests or questions relating to the privacy of your personal information.

Changes to this Privacy Notice

We may revise this Privacy Notice through an updated posting. We will identify the effective date of the revision in the posting. Often, updates are made to provide greater clarity or to comply with changes in regulatory requirements. If the updates involve material changes to the collection, protection, use or disclosure of Personal Information, Pearson will provide notice of the change through a conspicuous notice on this site or other appropriate way. Continued use of the site after the effective date of a posted revision evidences acceptance. Please contact us if you have questions or concerns about the Privacy Notice or any objection to any revisions.

Last Update: November 17, 2020