I’m trying to overwrite the function setRequest in /vendor/magento/module-usps/Model/Carrier.php to request “Online” rates from USPS.

My complete module code is below.

My module is enabled. I cleared var/di and var/generation. I ran the code compiler.

I viewed my store in frontend, added an item to my cart and clicked view & edit cart. The resulting page is white and only has the text “Estimate Shipping and Tax”.

The system log is full of messages that say “Cache file with merged layout” or “Broken reference”.

Thanks!

app/code/RSEI/improvedUSPS/etc/di.xml

<?xml version="1.0"?>  <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">     <preference for="Magento\Usps\Model\Carrier" type="RSEI\ImprovedUSPS\Model\Rewrite\Usps\Carrier" /> </config> 

app/code/RSEI/improvedUSPS/etc/module.xml

<?xml version="1.0"?> <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">     <module name="RSEI_improvedUSPS" setup_version="2.0.0"/> </config> 

app/code/RSEI/improvedUSPS/registration.php

  <?php   \Magento\Framework\Component\ComponentRegistrar::register(   \Magento\Framework\Component\ComponentRegistrar::MODULE,   'RSEI_improvedUSPS',   __DIR__   ); 

app/code/RSEI/improvedUSPS/Model/Rewrite/Usps

<?php namespace RSEI\ImprovedUSPS\Model\Rewrite\Usps;   class Carrier extends \Magento\Usps\Model\Carrier {   public function setRequest(\Magento\Quote\Model\Quote\Address\RateRequest $  request)     { $  this->_request = $  request;      $  r = new \Magento\Framework\DataObject();      if ($  request->getLimitMethod()) {         $  r->setService($  request->getLimitMethod());     } else {         $  r->setService('ONLINE');     }      if ($  request->getUspsUserid()) {         $  userId = $  request->getUspsUserid();     } else {         $  userId = $  this->getConfigData('userid');     }     $  r->setUserId($  userId);      if ($  request->getUspsContainer()) {         $  container = $  request->getUspsContainer();     } else {         $  container = $  this->getConfigData('container');     }     $  r->setContainer($  container);      if ($  request->getUspsSize()) {         $  size = $  request->getUspsSize();     } else {         $  size = $  this->getConfigData('size');     }     $  r->setSize($  size);      if ($  request->getGirth()) {         $  girth = $  request->getGirth();     } else {         $  girth = $  this->getConfigData('girth');     }     $  r->setGirth($  girth);      if ($  request->getHeight()) {         $  height = $  request->getHeight();     } else {         $  height = $  this->getConfigData('height');     }     $  r->setHeight($  height);      if ($  request->getLength()) {         $  length = $  request->getLength();     } else {         $  length = $  this->getConfigData('length');     }     $  r->setLength($  length);      if ($  request->getWidth()) {         $  width = $  request->getWidth();     } else {         $  width = $  this->getConfigData('width');     }     $  r->setWidth($  width);      if ($  request->getUspsMachinable()) {         $  machinable = $  request->getUspsMachinable();     } else {         $  machinable = $  this->getConfigData('machinable');     }     $  r->setMachinable($  machinable);      if ($  request->getOrigPostcode()) {         $  r->setOrigPostal($  request->getOrigPostcode());     } else {         $  r->setOrigPostal(             $  this->_scopeConfig->getValue(                 \Magento\Sales\Model\Order\Shipment::XML_PATH_STORE_ZIP,                 \Magento\Store\Model\ScopeInterface::SCOPE_STORE,                 $  request->getStoreId()             )         );     }  }  }