diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..96a8c20
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+watch.sh
\ No newline at end of file
diff --git a/README.md b/README.md
index df86b03..3ba4854 100644
--- a/README.md
+++ b/README.md
@@ -10,37 +10,52 @@ Here is some leaked source code for my brand new Cat website. Do not steal!
 
 ```shell
 #!/bin/bash
-printf '%s\n\n' 'Content-Type: text/html';
-
 source exprash.sh;
 
+redirectStdout 'log';
+
 declare -A cats;
 cats[calico]="Calico";
 cats[sphynx]="Sphynx";
 cats[ragdoll]="Ragdoll";
+cats[holland_lop]="Holland Lop";
 cats[scottish_fold]="Scottish Fold";
+cats[orange]="Orange";
 
 get '/' && {
-  printf '<h1>Cats</h1>\n';
-  printf '<ul>\n';
+  html='<h1>Cats</h1><ul>';
   for key in "${!cats[@]}"; do
-    printf '<li><a href="cats/%s">%s</a></li>\n' "$key" "${cats[$key]}";
+    html+="<li><a href=\"cats/${key}\">${cats[$key]}</a></li>";
   done
-  printf '</ul>\n';
+  html+='</ul>';
+
+  printf '%s' "$html" | send;
 }
 
 get '/cats/:cat' && {
   key=$(param 'cat');
 
   if [[ -v "cats[$key]" ]]; then
-    printf '<h1>Your Cat: %s</h1>\n' "${cats[$key]}";
+    if [ "$key" == 'holland_lop' ]; then
+      next "That's not a cat!";
+    else
+      printf '<h1>Your Cat: %s</h1>\n' "${cats[$key]}" | send;
+    fi;
   else
     next;
   fi;
 }
 
-use && {
-  printf '<h1>Error: Cannot find that cat</h1>\n';
+get '/cats/*' && {
+  printf '<h1>Error: Cannot find that cat</h1>\n' | send;
+}
+
+getError '/cats/*' && {
+  printf '<h1>%s</h1>' "$(errorMessage)" | send;
+}
+
+(use || useError) && {
+  printf '<h1>404</h1>' | send;
 }
 ```
 
diff --git a/examples/cats.sh b/examples/cats.sh
index 262dedb..ad8f36d 100644
--- a/examples/cats.sh
+++ b/examples/cats.sh
@@ -1,33 +1,48 @@
 #!/bin/bash
-printf '%s\n\n' 'Content-Type: text/html';
-
 source exprash.sh;
 
+redirectStdout 'log';
+
 declare -A cats;
 cats[calico]="Calico";
 cats[sphynx]="Sphynx";
 cats[ragdoll]="Ragdoll";
+cats[holland_lop]="Holland Lop";
 cats[scottish_fold]="Scottish Fold";
+cats[orange]="Orange";
 
 get '/' && {
-  printf '<h1>Cats</h1>\n';
-  printf '<ul>\n';
+  html='<h1>Cats</h1><ul>';
   for key in "${!cats[@]}"; do
-    printf '<li><a href="cats/%s">%s</a></li>\n' "$key" "${cats[$key]}";
+    html+="<li><a href=\"cats/${key}\">${cats[$key]}</a></li>";
   done
-  printf '</ul>\n';
+  html+='</ul>';
+
+  printf '%s' "$html" | send;
 }
 
 get '/cats/:cat' && {
   key=$(param 'cat');
 
   if [[ -v "cats[$key]" ]]; then
-    printf '<h1>Your Cat: %s</h1>\n' "${cats[$key]}";
+    if [ "$key" == 'holland_lop' ]; then
+      next "That's not a cat!";
+    else
+      printf '<h1>Your Cat: %s</h1>\n' "${cats[$key]}" | send;
+    fi;
   else
     next;
   fi;
 }
 
-use && {
-  printf '<h1>Error: Cannot find that cat</h1>\n';
+get '/cats/*' && {
+  printf '<h1>Error: Cannot find that cat</h1>\n' | send;
+}
+
+getError '/cats/*' && {
+  printf '<h1>%s</h1>' "$(errorMessage)" | send;
+}
+
+(use || useError) && {
+  printf '<h1>404</h1>' | send;
 }
diff --git a/run_tests.sh b/run_tests.sh
new file mode 100755
index 0000000..d6fdc99
--- /dev/null
+++ b/run_tests.sh
@@ -0,0 +1,10 @@
+#!/bin/bash
+source "$(dirname "$0")/src/exprash.sh";
+
+source "$(dirname "$0")/tests/utils.sh";
+
+printf '%s\n' "Routes:";
+source "$(dirname "$0")/tests/routes.sh";
+
+printf '\n';
+testSummary;
diff --git a/src/exprash.sh b/src/exprash.sh
index c48ab00..268287d 100644
--- a/src/exprash.sh
+++ b/src/exprash.sh
@@ -1,8 +1,30 @@
 #!/bin/bash
 # shellcheck disable=SC2034 # false flags nameref params
 
+# =====================
+# Require shell options
+# =====================
+
+# Necessary for piping to "send" funciton
+shopt -s lastpipe
+
+# ===============
+# Setup Functions
+# ===============
+
+# $1: Log file to redirect output
+function redirectStdout() {
+  local output="$1";
+  [ -z "$output" ] && output="/dev/null";
+
+  exec 5<&1;
+  _exprashRedirectStdout="$1";
+  exec 1>>"$_exprashRedirectStdout";
+  printf '%s: %s\n' "${REQUEST_METHOD:-UNKNOWN}" "${PATH_INFO:-/}"
+}
+
 # =============
-# Route Methods
+# Route Function
 # =============
 
 # $1: path
@@ -31,24 +53,96 @@ function delete() {
 
 # $1: path
 function all() {
-  [ "$routeHandled" -eq 1 ] && return 1;
+  [ "$_exprashRouteHandled" -eq 1 ] && return 1;
+  [ -n "$_exprashErrorMessage" ] && return 1;
 
   # Reset params
-  params=();
-  pathMatch "$1" params || return 1;
+  _exprashParams=();
+
+  pathMatch "$1" _exprashParams || return 1;
+  _exprashRouteHandled=1;
 
-  routeHandled=1;
   return 0;
 }
 
 function use() {
-  [ "$routeHandled" -eq 1 ] && return 1;
-  routeHandled=1;
+  [ "$_exprashRouteHandled" -eq 1 ] && return 1;
+  [ -n "$_exprashErrorMessage" ] && return 1;
+
+  _exprashRouteHandled=1;
+  return 0;
+}
+
+# =====================
+# Error Route Functions
+# =====================
+
+# $1: path
+function getError() {
+  [ "$REQUEST_METHOD" != "GET" ] && return 1;
+  allError "$1";
+}
+
+# $1: path
+function postError() {
+  [ "$REQUEST_METHOD" != "POST" ] && return 1;
+  allError "$1";
+}
+
+# $1: path
+function putError() {
+  [ "$REQUEST_METHOD" != "PUT" ] && return 1;
+  allError "$1";
+}
+
+# $1: path
+function deleteError() {
+  [ "$REQUEST_METHOD" != "DELETE" ] && return 1;
+  allError "$1";
+}
+
+# $1: path
+function allError() {
+  [ "$_exprashRouteHandled" -eq 1 ] && return 1;
+  [ -z "$_exprashErrorMessage" ] && return 1;
+
+  # Reset params
+  _exprashParams=();
+
+  pathMatch "$1" _exprashParams || return 1;
+  _exprashRouteHandled=1;
+
   return 0;
 }
 
+function useError() {
+  [ "$_exprashRouteHandled" -eq 1 ] && return 1;
+  [ -z "$_exprashErrorMessage" ] && return 1;
+
+  _exprashRouteHandled=1;
+  return 0;
+}
+
+# ====
+# Next
+# ====
+
+# $1 (optional): error message
 function next() {
-  routeHandled=0;
+  _exprashRouteHandled=0;
+  [ -n "$1" ] && _exprashErrorMessage="$1";
+}
+
+# =============
+# App Functions
+# =============
+
+function errorMessage() {
+  printf '%s' "$_exprashErrorMessage";
+}
+
+function hasErrorMessage() {
+  [ -n "$_exprashErrorMessage" ];
 }
 
 # =================
@@ -57,18 +151,51 @@ function next() {
 
 # $1: param name
 function param() {
-  printf '%s\n' "${params[$1]}";
+  printf '%s\n' "${_exprashParams[$1]}";
 }
 
-# $1: param name
 function hasParam() {
-  [[ -v "params[$1]" ]];
+  [[ -v "_exprashParams[$1]" ]];
+}
+
+# ==================
+# Response Functions
+# ==================
+
+function send() {
+  if [ "$_exprashHeadersSent" -eq 0 ]; then
+    sendHeaders
+    _exprashHeadersSent=1
+  fi
+
+  sendRaw
+}
+
+# $1: Header Name
+# $2: Header Value
+function setHeader() {
+  _exprashHeaders["$1"]="$2";
+}
+
+function sendHeaders() {
+  printf '%s\n' "Content-Type: ${_exprashHeaders['Content-Type']}" | sendRaw
+  for key in "${!_exprashHeaders[@]}"; do
+    [ "$key" == 'Content-Type' ] && continue
+    printf '%s\n' "${key}: ${_exprashHeaders[$key]}" | sendRaw
+  done;
+  printf '\n' | sendRaw
 }
 
 # =========
 # Internals
 # =========
 
+function sendRaw() {
+  [ -n "$_exprashRedirectStdout" ] && exec >&5;
+  cat;
+  [ -n "$_exprashRedirectStdout" ] && exec 1>>"$_exprashRedirectStdout";
+}
+
 # $1: path
 # $2: (nameref) array
 function pathToArray() {
@@ -84,25 +211,31 @@ function pathMatch() {
   local path="$PATH_INFO";
   local route="$1";
 
+  # Params associative array
+  local -n routeParams="$2";
+
   local pathArr;
   pathToArray "$path" pathArr;
 
   local routeArr;
   pathToArray "$route" routeArr;
 
-  # Params associative array
-  local -n routeParams="$2";
-
-  # Not a match if pathArr and routeArr have different length
-  [ "${#pathArr[@]}" -ne "${#routeArr[@]}" ] && return 1;
+  # Get max path length
+  local routeLen=${#routeArr[@]};
+  local pathLen=${#pathArr[@]};
+  local maxLen=$(( routeLen >= pathLen ? routeLen : pathLen ));
 
-  for ((i=0; i<${#routeArr[@]}; i++)); do
+  for ((i=0; i<maxLen; i++)); do
     local routeComponent="${routeArr[$i]}";
     local pathComponent="${pathArr[$i]}";
 
     # If route component starts with ":"
     if [[ "$routeComponent" == :* ]]; then
       routeParams["${routeComponent:1}"]="$pathComponent";
+    elif [[ "$routeComponent" == '*' ]] && [ -n "$pathComponent" ]; then
+      continue;
+    elif [[ "$routeComponent" == '**' ]] && [ -n "$pathComponent" ]; then
+      break;
     else
       # Confirm paths match
       [ "$routeComponent" != "$pathComponent" ] && return 1;
@@ -115,5 +248,18 @@ function pathMatch() {
 # =======
 # Globals
 # =======
-routeHandled=0;
-declare -A params;
+
+# Route globals
+function _exprashResetRouteGlobals() {
+  _exprashRouteHandled=0
+  _exprashErrorMessage=''
+  declare -gA _exprashParams
+  
+  _exprashHeadersSent=0
+  declare -gA _exprashHeaders
+  _exprashHeaders['Content-Type']='text/html'
+}
+_exprashResetRouteGlobals
+
+# Setup globals
+_exprashRedirectStdout=''
diff --git a/tests/routes.sh b/tests/routes.sh
new file mode 100755
index 0000000..7a474c6
--- /dev/null
+++ b/tests/routes.sh
@@ -0,0 +1,55 @@
+it "Should match plain route" $({
+  _exprashResetRouteGlobals
+  PATH_INFO='/plain/route'
+  all '/plain/route'
+})
+
+it "Should not match incorrect plain route" $({
+  _exprashResetRouteGlobals
+  PATH_INFO='/plain/WRONG'
+  ! all '/plain/route'
+})
+
+it "Should extract parameter" $({
+  _exprashResetRouteGlobals
+  PATH_INFO='/cats/calico/pet'
+  all '/cats/:cat/pet' && hasParam 'cat' && [ "$(param 'cat')" == 'calico' ]
+})
+
+it "Should match wildcard route" $({
+  _exprashResetRouteGlobals
+  PATH_INFO='/cats/calico/pet'
+  all '/cats/*/pet'
+})
+
+it "Should not match incorrect wildcard route" $({
+  _exprashResetRouteGlobals
+  PATH_INFO='/cats/calico/'
+  ! all '/cats/*/pet'
+})
+
+it "Should match multi-wildcard route" $({
+  _exprashResetRouteGlobals
+  PATH_INFO='/cats/calico/pet/donkey'
+  all '/cats/**'
+})
+
+it "Should not match incorrect multi-wildcard route" $({
+  _exprashResetRouteGlobals
+  PATH_INFO='/INCORRECT/calico/pet/donkey'
+  ! all '/cats/**'
+})
+
+it "Should match get route" $({
+  _exprashResetRouteGlobals
+  REQUEST_METHOD='GET'
+  PATH_INFO='/simple/route'
+  get '/simple/route'
+})
+
+it "Should not match get route with incorrect method" $({
+  _exprashResetRouteGlobals
+  REQUEST_METHOD='POST'
+  PATH_INFO='/simple/route'
+  ! get '/simple/route'
+})
diff --git a/tests/utils.sh b/tests/utils.sh
new file mode 100755
index 0000000..e97c002
--- /dev/null
+++ b/tests/utils.sh
@@ -0,0 +1,23 @@
+_testPassCount=0;
+_testTotalCount=0;
+
+function it() {
+  local exitCode=$?;
+  local message=$1;
+  local status;
+
+  _testTotalCount=$((_testTotalCount+1));
+
+  if [ "$exitCode" -eq 0 ]; then
+    status='✓';
+    _testPassCount=$((_testPassCount+1));
+  else
+    status='✗';
+  fi;
+
+  printf '%s %s\n' "$status" "$message";
+}
+
+function testSummary() {
+  printf 'Passed: %s of %s tests\n' "$_testPassCount" "$_testTotalCount";
+}