diff --git a/chronos/apps/http/httpclient.nim b/chronos/apps/http/httpclient.nim
index 83d5623..f63b24c 100644
--- a/chronos/apps/http/httpclient.nim
+++ b/chronos/apps/http/httpclient.nim
@@ -1039,7 +1039,7 @@ proc send*(request: HttpClientRequestRef): Future[HttpClientResponseRef] {.
   except CancelledError as exc:
     request.setError(newHttpInterruptError())
     raise exc
-  except AsyncStreamError as exc:
+  except AsyncStreamError:
     let error = newHttpWriteError("Could not send request headers")
     request.setError(error)
     raise error
@@ -1084,7 +1084,7 @@ proc open*(request: HttpClientRequestRef): Future[HttpBodyWriter] {.
   except CancelledError as exc:
     request.setError(newHttpInterruptError())
     raise exc
-  except AsyncStreamError as exc:
+  except AsyncStreamError:
     let error = newHttpWriteError("Could not send request headers")
     request.setError(error)
     raise error
@@ -1208,7 +1208,7 @@ proc getBodyBytes*(response: HttpClientResponseRef): Future[seq[byte]] {.
       await reader.closeWait()
     response.setError(newHttpInterruptError())
     raise exc
-  except AsyncStreamError as exc:
+  except AsyncStreamError:
     if not(isNil(reader)):
       await reader.closeWait()
     let error = newHttpReadError("Could not read response")
@@ -1233,7 +1233,7 @@ proc getBodyBytes*(response: HttpClientResponseRef,
       await reader.closeWait()
     response.setError(newHttpInterruptError())
     raise exc
-  except AsyncStreamError as exc:
+  except AsyncStreamError:
     if not(isNil(reader)):
       await reader.closeWait()
     let error = newHttpReadError("Could not read response")
@@ -1256,7 +1256,7 @@ proc consumeBody*(response: HttpClientResponseRef): Future[int] {.async.} =
       await reader.closeWait()
     response.setError(newHttpInterruptError())
     raise exc
-  except AsyncStreamError as exc:
+  except AsyncStreamError:
     if not(isNil(reader)):
       await reader.closeWait()
     let error = newHttpReadError("Could not read response")
diff --git a/chronos/apps/http/httpcommon.nim b/chronos/apps/http/httpcommon.nim
index 0423f22..860a7a7 100644
--- a/chronos/apps/http/httpcommon.nim
+++ b/chronos/apps/http/httpcommon.nim
@@ -7,7 +7,7 @@
 #  Apache License, version 2.0, (LICENSE-APACHEv2)
 #              MIT license (LICENSE-MIT)
 import std/[strutils, uri]
-import stew/[results, endians2], httputils
+import stew/results, httputils
 import ../../asyncloop, ../../asyncsync
 import ../../streams/[asyncstream, boundstream]
 export asyncloop, asyncsync, results, httputils, strutils
@@ -125,9 +125,8 @@ iterator queryParams*(query: string,
     if len(k) > 0:
       let v = if len(items) > 1: items[1] else: ""
       if CommaSeparatedArray in flags:
-        let key = decodeUrl(k)
         for av in decodeUrl(v).split(','):
-          yield (k, av)
+          yield (decodeUrl(k), av)
       else:
         yield (decodeUrl(k), decodeUrl(v))
 
@@ -249,48 +248,3 @@ func stringToBytes*(src: openArray[char]): seq[byte] =
     dst
   else:
     default
-
-proc dumpHex*(pbytes: openArray[byte], groupBy = 1, ascii = true): string =
-  ## Get hexadecimal dump of memory for array ``pbytes``.
-  var res = ""
-  var offset = 0
-  var ascii = ""
-
-  while offset < len(pbytes):
-    if (offset mod 16) == 0:
-      res = res & toHex(uint64(offset)) & ":  "
-
-    for k in 0 ..< groupBy:
-      let ch = pbytes[offset + k]
-      ascii.add(if ord(ch) > 31 and ord(ch) < 127: char(ch) else: '.')
-
-    let item =
-      case groupBy:
-      of 1:
-        toHex(pbytes[offset])
-      of 2:
-        toHex(uint16.fromBytes(pbytes.toOpenArray(offset, len(pbytes) - 1)))
-      of 4:
-        toHex(uint32.fromBytes(pbytes.toOpenArray(offset, len(pbytes) - 1)))
-      of 8:
-        toHex(uint64.fromBytes(pbytes.toOpenArray(offset, len(pbytes) - 1)))
-      else:
-        ""
-    res.add(item)
-    res.add(" ")
-    offset = offset + groupBy
-
-    if (offset mod 16) == 0:
-      res.add(" ")
-      res.add(ascii)
-      ascii.setLen(0)
-      res.add("\p")
-
-  if (offset mod 16) != 0:
-    let spacesCount = ((16 - (offset mod 16)) div groupBy) *
-                        (groupBy * 2 + 1) + 1
-    res = res & repeat(' ', spacesCount)
-    res = res & ascii
-
-  res.add("\p")
-  res
diff --git a/chronos/apps/http/multipart.nim b/chronos/apps/http/multipart.nim
index 971c000..2ec869a 100644
--- a/chronos/apps/http/multipart.nim
+++ b/chronos/apps/http/multipart.nim
@@ -604,7 +604,6 @@ proc beginPart*(mpw: MultiPartWriterRef, name: string,
   ## output stream.
   ##
   ## Note: `filename` and `name` arguments could be only ASCII strings.
-  const ContentDisposition = "Content-Disposition"
   doAssert(mpw.kind == MultiPartSource.Stream)
   doAssert(mpw.state in {MultiPartWriterState.MessageStarted,
                          MultiPartWriterState.PartFinished})