diff --git a/rest_framework/static/rest_framework/js/ajax-form.js b/rest_framework/static/rest_framework/js/ajax-form.js
index ce17729d1f..1483305ff9 100644
--- a/rest_framework/static/rest_framework/js/ajax-form.js
+++ b/rest_framework/static/rest_framework/js/ajax-form.js
@@ -37,6 +37,21 @@ function doAjaxSubmit(e) {
if (contentType) {
data = form.find('[data-override="content"]').val() || ''
+
+ if (contentType === 'multipart/form-data') {
+ // We need to add a boundary parameter to the header
+ // We assume the first valid-looking boundary line in the body is correct
+ // regex is from RFC 2046 appendix A
+ var boundaryCharNoSpace = "0-9A-Z'()+_,-./:=?";
+ var boundaryChar = boundaryCharNoSpace + ' ';
+ var re = new RegExp('^--([' + boundaryChar + ']{0,69}[' + boundaryCharNoSpace + '])[\\s]*?$', 'im');
+ var boundary = data.match(re);
+ if (boundary !== null) {
+ contentType += '; boundary="' + boundary[1] + '"';
+ }
+ // Fix textarea.value EOL normalisation (multipart/form-data should use CR+NL, not NL)
+ data = data.replace(/\n/g, '\r\n');
+ }
} else {
contentType = form.attr('enctype') || form.attr('encoding')
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