From http://www.sencha.com/forum/showthread.php?194911-OData-proxy-for-ExtJS-4.1/page2&s=683e867133933d8ee5905d4d2e404d81

odata.js

Ext.define('App.ODataProxy', {     extend:'Ext.data.proxy.Ajax',     requires:[         'Ext.data.reader.Json',         'Ext.data.writer.Json'     ],     alias:'proxy.odata',     sortParam:'$orderby',     filterParam:'$filter',     pageParam:null,     limitParam:'$top',     startParam:'$skip',     actionMethods: {         create:'POST',         read:'GET',         //Changed from PUT to allow writer to not writeAllFields.         update: Ext.isIE8m ? 'PUT' : 'PATCH',         destroy:'DELETE'     },     headers:{         Accept:'application/json;odata=verbose',         Prefer:'return-content'     },     constructor:function(cfg) {         cfg.reader = {             type:'json',             readRecords:function(data) {                 if (data.status == 204) {                     return null;                 }                 return this.self.prototype.readRecords.call(this, data['d']);             },             buildExtractors:function() {                 this.self.prototype.buildExtractors.apply(this, arguments);                 this.getRoot = this.getRootFunc;             },             getRootFunc:function(root) {                 return root['results'] || [root];             },             totalProperty:'__count',             metaProperty:'__metadata'         };         cfg.writer = {             type:'json',             writeAllFields:Ext.isIE8m         };         cfg.extraParams = Ext.apply({             "$inlinecount":'allpages'         },cfg.extraParams);         return this.callParent(arguments);     },     buildUrl:function(request) {         var me        = this,             operation = request.operation,             records   = operation.records || [],             record    = records[0],             url       = me.url,             id        = record ? record.getId() : operation.id;          if (id) {             url = url.replace(/\/?$/,'(' + id + ')');         }         if (request.url) {             url += request.url;         }         request.url = url;         return me.callParent(arguments);     },     encodeSorters:function(sorters) {         var sch, buf = [],             sorter;         for (sch = 0; sorter = sorters[sch]; sch++) {             buf.push(sorter.property + ' ' + sorter.direction.toLowerCase());         }         return buf.join(',');     },     encodeFilters:function(filters) {         var sch,             filterChecks = [],             filterBuf,             filter,             exact;         for (sch = 0; filter = filters[sch]; sch++) {             exact = filter.exactMatch;             filterBuf = [];             if (filter.exactMatch) {                 filterBuf.push('(');                 filterBuf.push(filter.value);                 filterBuf.push(' eq ');             } else {                 filterBuf.push('substringof(\'');                 filterBuf.push(filter.caseSensitive ? filter.value : filter.value.toLowerCase());                 filterBuf.push('\',');             }             if (!filter.caseSensitive && !exact) {                 filterBuf.push('tolower(');             }             filterBuf.push(filter.property);             if (!filter.caseSensitive && !exact) {                 filterBuf.push(')');             }             filterBuf.push(')');             filterChecks.push(filterBuf.join(''));         }         return filterChecks.join(' and ');     } });