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   Information on RFC 7540 » RFC Editor
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border-top:1px #A0B3C2 solid;
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.top{
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margin: 1px 0;
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#content {
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.postmetadata{
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ul#nav a, ul#admin a, #dropdown li.current_page_item a:hover, .top-menu li.current-menu-item a:hover, #dropdown li.current_page_item ul a, .top-menu li.current-menu-item ul a, ul#nav li.current_page_item a:hover, {
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width: 250px !important;
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#dropdown li ul ul, .top-menu li ul ul{
left:250px ; 
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.tags {
border-bottom:1px #A0B3C2 solid;
border-top:1px #A0B3C2 solid;
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a,h2 a:hover,h3 a:hover,#user_login,#user_pass, #sidenav a:visited {
color:#597EAA; 
text-decoration:none;
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#searchform #s {
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text-decoration:none;
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a:hover {
color:#114477; 
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a:visited{
color:#476588;
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#headerimg {
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text-decoration:none;
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-moz-box-shadow:none !important;
box-shadow:none !important;
-webkit-box-shadow: none !important;
opacity:1 !important;
border: none !important;
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top:20%;
}  #page {
width: 90%;
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.narrowcolumn {
float:left;
margin:0;
padding:25px 3% 20px 2%;
width:75%;
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#l_sidebar {
float:left;
padding:25px 1% 0 2%;
width:17%
}#dropdown, .top-menu{
text-align:left;
}#header {
background-repeat: no-repeat;  
background-position: center center;
height: 110px;
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.hleft, .hright {
height: 70px;
}table.statictable {
        font-family: verdana,arial,sans-serif;
        font-size:12px;
        color:#333333;
        border-width: 1px;
        border-color: #666666;
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        padding: 8px;
        border-style: solid;
        border-left: 1em;
        border-right: 1em;
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        border-right: 1em;
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          color:grey
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table.statictable td.title {
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         letter-spacing: inherit
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table.statictable .boldtext {
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       color: #597eaa;
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        font-family: verdana,arial,sans-serif;
        font-size:12px;
        color:#333333;
        border-width: 1px;
        border-color: #666666;
        border-collapse: collapse;
      
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table.dynamictable th {
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        padding: 8px;
        border-style: solid;
        border-left: 1em;
        border-right: 1em;
        border-color: #D2D2D2;
        background-color: #FEFEFEFE;
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table.dynamictable td {
        border-width: 1px;
        padding: 8px;
        border-style:solid;
        border-left: 1em;
        border-right: 1em;
        border-color: #D2D2D2;
      
}

table.dynamictable tr.even{
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}
table.dynamictable tr.odd{
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table.erratasearch {
        font-family: verdana,arial,sans-serif;
        font-size:12px;
        color:#333333;
        border-color: #666666;
        border-collapse: collapse;
        text-align:center;
}
table.erratasearch th {
        border-width: 1px;
        padding: 8px;
        
        text-decoration: underline;
        border-color: #666666;
        //background-color: #ffffff;
        background-color: silver;
}

table.erratasearch td {
        border-width: 1px;
        padding: 8px;
        border-color: #666666;
        background-color: #ffffff;
        text-align:left;
}
table.erratasearch td.sbar { 
          background-color: silver;
          text-align: center;
        }


.nosidebar{
    float:left;
    margin:0 10%;
    padding:0 0 10px;
    width:70%;
}

input[type="button"], .button, div#infinite-handle span {
    display: inline-block;
    zoom: 1; /* zoom and *display = ie7 hack for display:inline-block */
    *display: inline;
    vertical-align: baseline;
    margin: 0 2px;
    outline: none;
    cursor: pointer;
    text-align: center;
    text-decoration: none;
    padding: .3em 1em .35em;
    text-shadow: 0 1px 1px rgba(0,0,0,.3);
    -webkit-border-radius: .25em; 
    -moz-border-radius: .25em;
    border-radius: .25em;
    -webkit-box-shadow: 0 1px 2px rgba(0,0,0,.2);
    -moz-box-shadow: 0 1px 2px rgba(0,0,0,.2);
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    color: #505050;
    border: solid 1px #b7b7b7;
    background: #fff;
    background: -webkit-gradient(linear, left top, left bottom, from(#fff), to(#ededed));
    background: -moz-linear-gradient(top,  #fff,  #ededed);
    filter:  progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffffff', endColorstr='#ededed');
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    background: #ededed;
    background: -webkit-gradient(linear, left top, left bottom, from(#fff), to(#dcdcdc));
    background: -moz-linear-gradient(top,  #fff,  #dcdcdc);
    filter:  progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffffff', endColorstr='#dcdcdc');
}
input[type="button"]:active, .button:active, div#infinite-handle span: active {
    position: relative;
    top: 1px;
    color: #999;
    background: -webkit-gradient(linear, left top, left bottom, from(#ededed), to(#fff));
    background: -moz-linear-gradient(top,  #ededed,  #fff);
    filter:  progid:DXImageTransform.Microsoft.gradient(startColorstr='#ededed', endColorstr='#ffffff');
}

.search_label_bold { text-align: left;
                     border-style: none;
                     font-weight: bold;
                   }

.error { font-weight: bold; color: red; }

textarea {
   font-family: inherit;
   font-size: inherit;
}
/*DIV to hold scroll tables*/
.scrolltable{
   width:95%

}

/*--------------------------------------------------------------------------------
----------------------------RFCMETA PAGE  Styles---------------------------------------
-------------------------------------------------------------------------------*/
 body.rfcmeta {
font-family: 'Noto Sans', sans-serif;
color: #2C4353;
width: 100%;}

 body.rfcmeta #page {
width: 100%;
box-shadow:none;
margin-top: 0px;}

 body.rfcmeta .hright { height:120px;}

 body.rfcmeta #header {width: 100%;
 background-color: #fff;
 box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
    -moz-box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
        margin-bottom: 0px;;}

 body.rfcmeta .singlepost.entry {padding-top: 0px!important;}
 body.rfcmeta .singlepost.entry dl,  body.rfcmeta .singlepost.entry p, body.rfcmeta .singlepost.entry h2, body.rfcmeta .singlepost.entry h3 { margin-left:40px;
 margin-right: 20px; }

 body.rfcmeta .singlepost.entry dt{
         font-weight: bold!important;
         margin-top: 15px;}

          body.rfcmeta .singlepost.entry dd{
         margin-left: 15px;}

 body.rfcmeta a{
color: #597eaa;}
  body.rfcmeta .entryheader {background-color:#2C4353 !important;
  border-bottom: 10px solid #FFF !important;
  margin-top: 0px;
  padding-top: 20px !important;
  padding-bottom: 20px !important;}

   body.rfcmeta .entryheader h2 a, body.rfcmeta .entryheader h2 {color: #fff  !important;
   font-size: 50px;
   padding: 0px !important;
   line-height: 1.2;
   font:bold !important;}

   body.rfcmeta .entryheader h2 a:hover {color: #aob3c2 !important;}

   body.rfcmeta .entryheader h3 {color: #fff  !important;
   font-size: 18px;
   padding: 0px;
   line-height: 1.2;
   padding-top: 10px;
   }

      body.rfcmeta .entryheader h3 span {font-weight: normal;
          font-size: 14px;
          text-transform: uppercase;}
    h2 {font-weight: bold;}

 body.rfcmeta   #search_query_separator_id  {padding-bottom: 5px;
 padding-top: 5px;}

 body.rfcmeta .page {margin-top: 0px!important;
 padding-top: 0px!important;}

    /*--------------------------------------------------------------------------------
----------------------------end RFCMETA PAGE Styles---------------------------------------
-------------------------------------------------------------------------------*/

.cluster_heading {
 font-size: 14px;
}</style><style>#header {
            background-image: url();
        }</style><meta content="Hypertext Transfer Protocol Version 2 (HTTP/2)"name=citation_title><meta content="M. Belshe"name=citation_author><meta content="R. Peon"name=citation_author><meta content="M. Thomson, Ed."name=citation_author><meta content=2015 name=citation_publication_date><meta content=2070-1721 name=citation_issn><meta content=https://www.rfc-editor.org/rfc/rfc7540.txt name=citation_pdf_url><meta content="RFC 7540"name=citation_technical_report_number><body class=rfcmeta><a id=top> </a><div id=page><div id=header><div class=hright><div class="hwidget widget_text"><h2 class=widgettitle>Search RFCs</h2><div class=textwidget><form onsubmit="return validateComboBox(this);"action=/search/rfc_search_detail.php id=search_query_separator_id method=POST name=search_query_separator_name><input placeholder="number, title, keyword, or author surname"id=combo_box_id maxlength=40 name=combo_box size=35></form><a href=/search/rfc_search.php> Advanced Search </a></div></div></div><div id=headerimgwrap><div id=headerimg><h1 class=blog_title><a href=https://www.rfc-editor.org/> RFC Editor </a></h1></div></div></div><div class=nosidebar id=content><h1 class=post_title></h1><div class="post-127 page type-page status-publish hentry post clear"id=post-127><div class="singlepost entry"><div class=entryheader><h2><a href=https://www.rfc-editor.org/rfc/rfc7540.txt> RFC 7540 </a></h2><h3>Hypertext Transfer Protocol Version 2 (HTTP/2), <span> May 2015 </span></h3></div><dl><dt><b> File formats: </b><dd><a href=https://www.rfc-editor.org/rfc/rfc7540.txt> <img alt="icon for text file"src=/rfcscripts/images/RFC_ICONS_Text_40x50.png title=text> </a> <a href=https://www.rfc-editor.org/rfc/pdfrfc/rfc7540.txt.pdf> <img alt="icon for PDF"src=/rfcscripts/images/RFC_ICONS_PDF_2019_50x40.png title=PDF> </a> <a href=https://www.rfc-editor.org/rfc/rfc7540.html> <img alt="icon for HTML"src=/rfcscripts/images/RFC_ICONS_HTML_40x50.png title=HTML> </a> <a href=https://www.rfc-editor.org/rfc/inline-errata/rfc7540.html> <img alt="icon for inline errata"title="HTML with inline errata"src=/rfcscripts/images/HTML_correction_40x50_2020.png> </a><dt><b> Status: </b><dd>PROPOSED STANDARD<dt><b> Updated by: </b><dd><a href=/info/rfc8740> RFC 8740 </a><dt><b> Authors: </b><dd>M. Belshe <br> R. Peon <br> M. Thomson, Ed.<dt><b> Stream: </b><dd><a href=http://www.ietf.org> IETF </a><dt><b> Source: </b><dd><a href=//datatracker.ietf.org/wg/httpbis/charter/> httpbis </a> ( <a href=//datatracker.ietf.org/wg/#app/> app </a> )</dl><p><b> Cite this RFC </b> : <a href=/refs/ref7540.txt> TXT </a>  |  <a href=/refs/bibxml/reference.RFC.7540.xml> XML </a><p><b> DOI </b> :  10.17487/RFC7540<p><b> Discuss this RFC </b> : Send questions or comments to <a href="mailto:ietf-http-wg@w3.org?subject=Question regarding RFC 7540 "> ietf-http-wg@w3.org </a><p><b> Other actions </b> : <a href=/errata/rfc7540> View Errata </a>  |  <a href=/errata.php#reportnew> Submit Errata </a>  |  <a href=https://datatracker.ietf.org/ipr/search/?draft=&rfc=7540&submit=rfc> Find IPR Disclosures from the IETF </a>  |  <a href=https://datatracker.ietf.org/doc/rfc7540/> View History of RFC 7540 </a><hr><h2>Abstract</h2><p>This specification describes an optimized expression of the semantics of the Hypertext Transfer Protocol (HTTP), referred to as HTTP version 2 (HTTP/2). HTTP/2 enables a more efficient use of network resources and a reduced perception of latency by introducing header field compression and allowing multiple concurrent exchanges on the same connection. It also introduces unsolicited push of representations from servers to clients.<p>This specification is an alternative to, but does not obsolete, the HTTP/1.1 message syntax. HTTP's existing semantics remain unchanged.<hr><p>For the definition of <b> Status </b> , see <a href=/info/rfc2026> RFC 2026 </a> .<p>For the definition of <b> Stream </b> , see <a href=/info/rfc8729> RFC 8729 </a> .<hr></div></div></div><br><br><div id=footer><div id=footerdivs></div><div style=clear:both></div><p class=credit><a href=//www.iab.org/> IAB </a> • <a href=//www.iana.org/> IANA </a> • <a href=//www.ietf.org> IETF </a> • <a href=//www.irtf.org> IRTF </a> • <a href=/about/independent> ISE </a> • <a href=//www.internetsociety.org> ISOC </a> • <a href=//trustee.ietf.org/> IETF Trust </a> <br> <a href=/report-summary> Reports </a> • <a href=//www.ietf.org/privacy-statement/> Privacy Statement </a> • <a href=/sitemap> Site Map </a> • <a href=/contact> Contact Us </a></div></div><script src=https://www.rfc-editor.org/wp-includes/js/wp-embed.min.js?ver=5.0.3></script>