but I get an error 500 from the server if I do anything more complex. I've tried escaping all the double quotes (") like this (\") or changing them to single quotes (') but it still fails.
{"apikey":"
...","cid":"c9546f7dff","name":"content","value":{"html":"<!DOCTYPE html><html><head></head><body><center>
<table border='0' cellpadding='0' cellspacing='0' height='100%' width='100%' id='backgroundTable'>
<tbody><tr>
<td align='center' valign='top'>
<!-- // Begin Template Preheader \\ -->
<table border='0' cellpadding='10' cellspacing='0' width='600' id='templatePreheader'>
<tbody><tr>
<td valign='top' class='preheaderContent'>
<!-- // Begin Module: Standard Preheader \ -->
<table border='0' cellpadding='10' cellspacing='0' width='100%'>
<tbody><tr>
<td valign='top'>
<div mc:edit='std_preheader_content' contenteditable='true' class='cke_editable cke_editable_inline cke_contents_ltr' tabindex='0' spellcheck='false' role='textbox' aria-label='Rich Text Editor, editor1' title='Rich Text Editor, editor1' aria-describedby='cke_119' style='position: relative;'><p>Use this area to offer a short teaser of your email's content. Text here will show in the preview area of some email clients.</p></div>
</td>
<!-- *|IFNOT:ARCHIVE_PAGE|* -->
<td valign='top' width='190'>
<div mc:edit='std_preheader_links' contenteditable='true' class='cke_editable cke_editable_inline cke_contents_ltr' tabindex='0' spellcheck='false' role='textbox' aria-label='Rich Text Editor, editor2' title='Rich Text Editor, editor2' aria-describedby='cke_166' style='position: relative;'><p>Is this email not displaying correctly?<br><a data-cke-saved-href='*|ARCHIVE|*' href='*|ARCHIVE|*' target='_blank'>View it in your browser</a>.</p></div>
</td>
<!-- *|END:IF|* -->
</tr>
</tbody></table>
<!-- // End Module: Standard Preheader \ -->
</td>
</tr>
</tbody></table>
<!-- // End Template Preheader \\ -->
<table border='0' cellpadding='0' cellspacing='0' width='600' id='templateContainer'>
<tbody><tr>
<td align='center' valign='top'>
<!-- // Begin Template Header \\ -->
<table border='0' cellpadding='0' cellspacing='0' width='600' id='templateHeader'>
<tbody><tr>
<td class='headerContent'>
<!-- // Begin Module: Standard Header Image \\ -->
<!-- // End Module: Standard Header Image \\ -->
</td>
</tr>
</tbody></table>
<!-- // End Template Header \\ -->
</td>
</tr>
<tr>
<td align='center' valign='top'>
<!-- // Begin Template Body \\ -->
<table border='0' cellpadding='0' cellspacing='0' width='600' id='templateBody'>
<tbody><tr>
<!-- // Begin Sidebar \\ -->
<td valign='top' width='200' id='templateSidebar'>
<table border='0' cellpadding='0' cellspacing='0' width='200'>
<tbody><tr>
<td valign='top' class='sidebarContent'>
<!-- // Begin Module: Social Block with Icons \\ -->
<table border='0' cellpadding='0' cellspacing='0' width='100%'>
<tbody><tr>
<td valign='top' style='padding-top:20px; padding-right:20px; padding-left:20px;'>
<table border='0' cellpadding='0' cellspacing='4'>
<tbody><tr mc:hideable=''>
<td align='left' valign='middle' width='24' style='padding-bottom:5px;'>
</td>
<td align='left' valign='middle' style='padding-bottom:5px;'>
<div mc:edit='sbwi_link_one' contenteditable='true' class='cke_editable cke_editable_inline cke_contents_ltr' tabindex='0' spellcheck='false' role='textbox' aria-label='Rich Text Editor, editor4' title='Rich Text Editor, editor4' aria-describedby='cke_260' style='position: relative;'><p><a data-cke-saved-href='*|FACEBOOK:PROFILEURL|*' href='*|FACEBOOK:PROFILEURL|*'>Friend on Facebook</a></p></div>
</td>
</tr>
<tr mc:hideable=''>
<td align='left' valign='middle' width='24' style='padding-bottom:5px;'>
</td>
<td align='left' valign='middle' style='padding-bottom:5px;'>
<div mc:edit='sbwi_link_two' contenteditable='true' class='cke_editable cke_editable_inline cke_contents_ltr' tabindex='0' spellcheck='false' role='textbox' aria-label='Rich Text Editor, editor5' title='Rich Text Editor, editor5' aria-describedby='cke_307' style='position: relative;'><p><a data-cke-saved-href='*|TWITTER:PROFILEURL|*' href='*|TWITTER:PROFILEURL|*'>Follow on Twitter</a></p></div>
</td>
</tr>
<tr mc:hideable=''>
<td align='left' valign='middle' width='24' style='padding-bottom:5px;'>
</td>
<td align='left' valign='middle' style='padding-bottom:5px;'>
<div mc:edit='sbwi_link_three' contenteditable='true' class='cke_editable cke_editable_inline cke_contents_ltr' tabindex='0' spellcheck='false' role='textbox' aria-label='Rich Text Editor, editor6' title='Rich Text Editor, editor6' aria-describedby='cke_354' style='position: relative;'><p><a data-cke-saved-href='*|FORWARD|*' href='*|FORWARD|*'>Forward to a Friend</a></p></div>
</td>
</tr>
</tbody></table>
</td>
</tr>
</tbody></table>
<!-- // End Module: Social Block with Icons \\ -->
<!-- // Begin Module: Top Image with Content \\ -->
<table border='0' cellpadding='20' cellspacing='0' width='100%'>
<tbody><tr mc:repeatable=''>
<td valign='top'>
<div mc:edit='tiwc200_content00' contenteditable='true' class='cke_editable cke_editable_inline cke_contents_ltr' tabindex='0' spellcheck='false' role='textbox' aria-label='Rich Text Editor, editor8' title='Rich Text Editor, editor8' aria-describedby='cke_448' style='position: relative;'><h4>Heading 4</h4><p><strong>Repeatable content blocks:</strong> Repeatable sections are noted with plus and minus signs so that you can add and subtract content blocks. You can also <a data-cke-saved-href='
http://www.mailchimp.com/kb/article/how-do-i-work-with-repeatable-content-blocks' href='
http://www.mailchimp.com/kb/article/how-do-i-work-with-repeatable-content-blocks' target='_blank'>get a little fancy</a>: repeat blocks and remove all text to make image 'gallery' sections, or do the opposite and remove images for text-only blocks!</p></div>
</td>
</tr>
</tbody></table>
<!-- // End Module: Top Image with Content \\ -->
</td>
</tr>
</tbody></table>
</td>
<!-- // End Sidebar \\ -->
<td valign='top' width='400'>
<table border='0' cellpadding='0' cellspacing='0' width='400'>
<tbody><tr>
<td valign='top'>
<table border='0' cellpadding='0' cellspacing='0' width='400'>
<tbody><tr>
<td valign='top' class='bodyContent'>
<!-- // Begin Module: Standard Content \\ -->
<table border='0' cellpadding='20' cellspacing='0' width='100%'>
<tbody><tr>
<td valign='top'>
<div mc:edit='std_content00' contenteditable='true' class='cke_editable cke_editable_inline cke_contents_ltr cke_focus' tabindex='0' spellcheck='false' role='textbox' aria-label='Rich Text Editor, editor9' title='Rich Text Editor, editor9' aria-describedby='cke_495' style='position: relative;'><h1>TEST 1</h1><h2>Heading 2</h2><h3>Heading 3</h3><h4>Heading 4</h4><p><strong>Getting started:</strong> Customize your template by clicking on the style editor tabs up above. Set your fonts, colors, and styles. After setting your styling is all done you can click here in this area, delete the text, and start adding your own awesome content!<br><br>After you enter your content, highlight the text you want to style and select the options you set in the style editor in the 'styles' drop down box. Want to <a data-cke-saved-href='
http://www.mailchimp.com/kb/article/im-using-the-style-designer-and-i-cant-get-my-formatting-to-change' href='
http://www.mailchimp.com/kb/article/im-using-the-style-designer-and-i-cant-get-my-formatting-to-change' target='_blank'>get rid of styling on a bit of text</a>, but having trouble doing it? Just use the 'clear styles' button to strip the text of any formatting and reset your style.</p></div>
</td>
</tr>
</tbody></table>
<!-- // End Module: Standard Content \\ -->
</td>
</tr>
</tbody></table>
</td>
</tr>
<tr>
<td valign='top'>
<table border='0' cellpadding='0' cellspacing='0' width='400'>
<tbody><tr>
<td valign='top' width='180' class='leftColumnContent'>
<!-- // Begin Module: Top Image with Content \\ -->
<table border='0' cellpadding='20' cellspacing='0' width='100%'>
<tbody><tr mc:repeatable=''>
<td valign='top'>
<div mc:edit='tiwc200_content01' contenteditable='true' class='cke_editable cke_editable_inline cke_contents_ltr' tabindex='0' spellcheck='false' role='textbox' aria-label='Rich Text Editor, editor11' title='Rich Text Editor, editor11' aria-describedby='cke_589' style='position: relative;'><h4>Heading 4</h4><p><strong>Repeatable content blocks:</strong> Repeatable sections are noted with plus and minus signs so that you can add and subtract content blocks. You can also <a data-cke-saved-href='
http://www.mailchimp.com/kb/article/how-do-i-work-with-repeatable-content-blocks' href='
http://www.mailchimp.com/kb/article/how-do-i-work-with-repeatable-content-blocks' target='_blank'>get a little fancy</a>: repeat blocks and remove all text to make image 'gallery' sections, or do the opposite and remove images for text-only blocks!</p></div>
</td>
</tr>
</tbody></table>
<!-- // End Module: Top Image with Content \\ -->
</td>
<td valign='top' width='180' class='rightColumnContent'>
<!-- // Begin Module: Top Image with Content \\ -->
<table border='0' cellpadding='20' cellspacing='0' width='100%'>
<tbody><tr mc:repeatable=''>
<td valign='top'>
<div mc:edit='tiwc200_content02' contenteditable='true' class='cke_editable cke_editable_inline cke_contents_ltr' tabindex='0' spellcheck='false' role='textbox' aria-label='Rich Text Editor, editor13' title='Rich Text Editor, editor13' aria-describedby='cke_683' style='position: relative;'><h4>Heading 4</h4><p><strong>Repeatable content blocks:</strong> Repeatable sections are noted with plus and minus signs so that you can add and subtract content blocks. You can also <a data-cke-saved-href='
http://www.mailchimp.com/kb/article/how-do-i-work-with-repeatable-content-blocks' href='
http://www.mailchimp.com/kb/article/how-do-i-work-with-repeatable-content-blocks' target='_blank'>get a little fancy</a>: repeat blocks and remove all text to make image 'gallery' sections, or do the opposite and remove images for text-only blocks!</p></div>
</td>
</tr>
</tbody></table>
<!-- // End Module: Top Image with Content \\ -->
</td>
</tr>
</tbody></table>
</td>
</tr>
</tbody></table>
</td>
</tr>
</tbody></table>
<!-- // End Template Body \\ -->
</td>
</tr>
<tr>
<td align='center' valign='top'>
<!-- // Begin Template Footer \\ -->
<table border='0' cellpadding='10' cellspacing='0' width='600' id='templateFooter'>
<tbody><tr>
<td valign='top' class='footerContent'>
<!-- // Begin Module: Standard Footer \\ -->
<table border='0' cellpadding='10' cellspacing='0' width='100%'>
<tbody><tr>
<td colspan='2' valign='middle' id='social'>
<div mc:edit='std_social' contenteditable='true' class='cke_editable cke_editable_inline cke_contents_ltr' tabindex='0' spellcheck='false' role='textbox' aria-label='Rich Text Editor, editor14' title='Rich Text Editor, editor14' aria-describedby='cke_730' style='position: relative;'><p> <a data-cke-saved-href='*|TWITTER:PROFILEURL|*' href='*|TWITTER:PROFILEURL|*'>follow on Twitter</a> | <a data-cke-saved-href='*|FACEBOOK:PROFILEURL|*' href='*|FACEBOOK:PROFILEURL|*'>friend on Facebook</a> | <a data-cke-saved-href='*|FORWARD|*' href='*|FORWARD|*'>forward to a friend</a> </p></div>
</td>
</tr>
<tr>
<td valign='top' width='350'>
<div mc:edit='std_footer' contenteditable='true' class='cke_editable cke_editable_inline cke_contents_ltr' tabindex='0' spellcheck='false' role='textbox' aria-label='Rich Text Editor, editor15' title='Rich Text Editor, editor15' aria-describedby='cke_777' style='position: relative;'><p><em>Copyright © *|CURRENT_YEAR|* *|LIST:COMPANY|*, All rights reserved.</em><br>*|IFNOT:ARCHIVE_PAGE|* *|LIST:DESCRIPTION|*<br><strong>Our mailing address is:</strong><br>*|HTML:LIST_ADDRESS_HTML|**|END:IF|*</p></div>
</td>
<td valign='top' width='190' id='monkeyRewards'>
<div mc:edit='monkeyrewards' contenteditable='true' class='cke_editable cke_editable_inline cke_contents_ltr' tabindex='0' spellcheck='false' role='textbox' aria-label='Rich Text Editor, editor16' title='Rich Text Editor, editor16' aria-describedby='cke_824' style='position: relative;'><p>*|IF:REWARDS|* *|HTML:REWARDS|* *|END:IF|*</p></div>
</td>
</tr>
<tr>
<td colspan='2' valign='middle' id='utility'>
<div mc:edit='std_utility' contenteditable='true' class='cke_editable cke_editable_inline cke_contents_ltr' tabindex='0' spellcheck='false' role='textbox' aria-label='Rich Text Editor, editor17' title='Rich Text Editor, editor17' aria-describedby='cke_871' style='position: relative;'><p> <a data-cke-saved-href='*|UNSUB|*' href='*|UNSUB|*'>unsubscribe from this list</a> | <a data-cke-saved-href='*|UPDATE_PROFILE|*' href='*|UPDATE_PROFILE|*'>update subscription preferences</a> </p></div>
</td>
</tr>
</tbody></table>
<!-- // End Module: Standard Footer \\ -->
</td>
</tr>
</tbody></table>
<!-- // End Template Footer \\ -->
</td>
</tr>
</tbody></table>
<br>
</td>
</tr>
</tbody></table>
</center>
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