RFC1867 was updated by RFC2388

docs/curl.1

@@ -480,7 +480,7 @@ waits for a reply from the server.
 .IP "-F/--form <name=content>"
 (HTTP) This lets curl emulate a filled-in form in which a user has pressed the
 submit button. This causes curl to POST data using the Content-Type
-multipart/form-data according to RFC1867. This enables uploading of binary
+multipart/form-data according to RFC2388. This enables uploading of binary
 files etc. To force the 'content' part to be a file, prefix the file name
 with an @ sign. To just get the content part from a file, prefix the file name
 with the symbol <. The difference between @ and < is then that @ makes a file

docs/libcurl/curl_easy_setopt.3

@@ -870,7 +870,7 @@ data using the read callback!
 Using POST with HTTP 1.1 implies the use of a "Expect: 100-continue" header.
 You can disable this header with \fICURLOPT_HTTPHEADER\fP as usual.
 
-To make multipart/formdata posts (aka rfc1867-posts), check out the
+To make multipart/formdata posts (aka RFC2388-posts), check out the
 \fICURLOPT_HTTPPOST\fP option.
 .IP CURLOPT_POSTFIELDSIZE
 If you want to post data to the server without letting libcurl do a strlen()

docs/libcurl/curl_formadd.3

@@ -13,7 +13,7 @@ curl_formadd - add a section to a multipart/formdata HTTP POST
 .ad
 .SH DESCRIPTION
 curl_formadd() is used to append sections when building a multipart/formdata
-HTTP POST (sometimes referred to as rfc1867-style posts). Append one section at
+HTTP POST (sometimes referred to as RFC2388-style posts). Append one section at
 a time until you've added all the sections you want included and then you pass
 the \fIfirstitem\fP pointer as parameter to \fBCURLOPT_HTTPPOST\fP.
 \fIlastitem\fP is set after each call and on repeated invokes it should be

docs/libcurl/libcurl-tutorial.3

@@ -502,13 +502,14 @@ then passing that list to libcurl.
 While the simple examples above cover the majority of all cases where HTTP
 POST operations are required, they don't do multi-part formposts. Multi-part
 formposts were introduced as a better way to post (possibly large) binary data
-and were first documented in the RFC1867. They're called multi-part because
-they're built by a chain of parts, each being a single unit. Each part has its
-own name and contents. You can in fact create and post a multi-part formpost
-with the regular libcurl POST support described above, but that would require
-that you build a formpost yourself and provide to libcurl. To make that
-easier, libcurl provides \fIcurl_formadd(3)\fP. Using this function, you add
-parts to the form. When you're done adding parts, you post the whole form.
+and were first documented in the RFC1867 (updated in RFC2388). They're called
+multi-part because they're built by a chain of parts, each part being a single
+unit of data. Each part has its own name and contents. You can in fact create
+and post a multi-part formpost with the regular libcurl POST support described
+above, but that would require that you build a formpost yourself and provide
+to libcurl. To make that easier, libcurl provides \fIcurl_formadd(3)\fP. Using
+this function, you add parts to the form. When you're done adding parts, you
+post the whole form.
 
 The following example sets two simple text parts with plain textual contents,
 and then a file with binary contents and uploads the whole thing.