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Using a proxy with .NET 4.5 HttpClient

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50

8

I'm troubleshooting a bug with a service I call through .NET's HttpClient, trying to route the request through a local proxy (Fiddler), but my proxy settings seem to not be taking effect.

Here's how I create the client:

private HttpClient CreateHttpClient(CommandContext ctx, string sid) 
 var cookies = new CookieContainer();

 var handler = new HttpClientHandler 
 CookieContainer = cookies,
 UseCookies = true,
 UseDefaultCredentials = false,
 Proxy = new WebProxy("http://localhost:8888", false, new string[]),
 UseProxy = true,
 ;

 // snip out some irrelevant setting of authentication cookies

 var client = new HttpClient(handler) 
 BaseAddress = _prefServerBaseUrl,
 ;

 client.DefaultRequestHeaders.Accept.Add(
 new MediaTypeWithQualityHeaderValue("application/json"));

 return client;

then I send the request by:

var response = CreateHttpClient(ctx, sid).PostAsJsonAsync("api/prefs/", smp).Result;

Request goes straight to the server without attempting to hit the proxy. What did I miss?

.net asp.net-web-api .net-4.5

share|improve this question

edited Feb 29 '16 at 14:57

Uwe Keim

27.9k32140220

asked May 13 '13 at 16:17

Mike RuhlinMike Ruhlin

2,85011630

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Is your service under test on your local machine? Consider proxy bypassing for local addresses.
  
  – Xaqron
  May 13 '13 at 16:33
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  By the way, creating HttpClient instances is expensive. You should reuse instances whenever possible. There are a few blog posts that talk about this reachable using Google.
  
  – NathanAldenSr
  May 13 '16 at 2:07
  
  

  
  
  
  

add a comment | 

50

8

I'm troubleshooting a bug with a service I call through .NET's HttpClient, trying to route the request through a local proxy (Fiddler), but my proxy settings seem to not be taking effect.

Here's how I create the client:

private HttpClient CreateHttpClient(CommandContext ctx, string sid) 
 var cookies = new CookieContainer();

 var handler = new HttpClientHandler 
 CookieContainer = cookies,
 UseCookies = true,
 UseDefaultCredentials = false,
 Proxy = new WebProxy("http://localhost:8888", false, new string[]),
 UseProxy = true,
 ;

 // snip out some irrelevant setting of authentication cookies

 var client = new HttpClient(handler) 
 BaseAddress = _prefServerBaseUrl,
 ;

 client.DefaultRequestHeaders.Accept.Add(
 new MediaTypeWithQualityHeaderValue("application/json"));

 return client;

then I send the request by:

var response = CreateHttpClient(ctx, sid).PostAsJsonAsync("api/prefs/", smp).Result;

Request goes straight to the server without attempting to hit the proxy. What did I miss?

.net asp.net-web-api .net-4.5

share|improve this question

edited Feb 29 '16 at 14:57

Uwe Keim

27.9k32140220

asked May 13 '13 at 16:17

Mike RuhlinMike Ruhlin

2,85011630

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Is your service under test on your local machine? Consider proxy bypassing for local addresses.
  
  – Xaqron
  May 13 '13 at 16:33
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  By the way, creating HttpClient instances is expensive. You should reuse instances whenever possible. There are a few blog posts that talk about this reachable using Google.
  
  – NathanAldenSr
  May 13 '16 at 2:07
  
  

  
  
  
  

add a comment | 

I'm troubleshooting a bug with a service I call through .NET's HttpClient, trying to route the request through a local proxy (Fiddler), but my proxy settings seem to not be taking effect.

Here's how I create the client:

private HttpClient CreateHttpClient(CommandContext ctx, string sid) 
 var cookies = new CookieContainer();

 var handler = new HttpClientHandler 
 CookieContainer = cookies,
 UseCookies = true,
 UseDefaultCredentials = false,
 Proxy = new WebProxy("http://localhost:8888", false, new string[]),
 UseProxy = true,
 ;

 // snip out some irrelevant setting of authentication cookies

 var client = new HttpClient(handler) 
 BaseAddress = _prefServerBaseUrl,
 ;

 client.DefaultRequestHeaders.Accept.Add(
 new MediaTypeWithQualityHeaderValue("application/json"));

 return client;

then I send the request by:

var response = CreateHttpClient(ctx, sid).PostAsJsonAsync("api/prefs/", smp).Result;

Request goes straight to the server without attempting to hit the proxy. What did I miss?

.net asp.net-web-api .net-4.5

share|improve this question

edited Feb 29 '16 at 14:57

Uwe Keim

27.9k32140220

asked May 13 '13 at 16:17

Mike RuhlinMike Ruhlin

2,85011630

private HttpClient CreateHttpClient(CommandContext ctx, string sid) 
 var cookies = new CookieContainer();

 var handler = new HttpClientHandler 
 CookieContainer = cookies,
 UseCookies = true,
 UseDefaultCredentials = false,
 Proxy = new WebProxy("http://localhost:8888", false, new string[]),
 UseProxy = true,
 ;

 // snip out some irrelevant setting of authentication cookies

 var client = new HttpClient(handler) 
 BaseAddress = _prefServerBaseUrl,
 ;

 client.DefaultRequestHeaders.Accept.Add(
 new MediaTypeWithQualityHeaderValue("application/json"));

 return client;

var response = CreateHttpClient(ctx, sid).PostAsJsonAsync("api/prefs/", smp).Result;

share|improve this question

edited Feb 29 '16 at 14:57

Uwe Keim

27.9k32140220

asked May 13 '13 at 16:17

Mike RuhlinMike Ruhlin

2,85011630

share|improve this question

edited Feb 29 '16 at 14:57

Uwe Keim

27.9k32140220

asked May 13 '13 at 16:17

Mike RuhlinMike Ruhlin

2,85011630

edited Feb 29 '16 at 14:57

Uwe Keim

27.9k32140220

edited Feb 29 '16 at 14:57

Uwe Keim

27.9k32140220

asked May 13 '13 at 16:17

Mike RuhlinMike Ruhlin

2,85011630

asked May 13 '13 at 16:17

Mike RuhlinMike Ruhlin

2,85011630

3 Answers
3

active

oldest

votes

49

This code worked for me:

var httpClientHandler = new HttpClientHandler
 
 Proxy = new WebProxy("http://localhost:8888", false),
 UseProxy = true
 

Note that I am not supplying an empty array to my WebProxy constructor. Perhaps that's the problem?

share|improve this answer

answered Jul 10 '14 at 12:57

NathanAldenSrNathanAldenSr

6,39733045

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Removing the string array worked for me too. I had to an entry to HOSTS to get the proxy to work on localhost.
  
  – Casey Burns
  Nov 15 '14 at 10:18
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  You just saved my day ^_^
  
  – Wahid Bitar
  Mar 17 '17 at 8:04
  

  
  
  
  

add a comment | 

7

Ah, The BaseAddress I was pointing to was http://localhost:8081. Turns out that despite setting BypassOnLocal to false, evidently localhost is still special enough that it bypasses the proxy.

I added a domain binding in IIS, host file entry to point that domain to 127.0.0.1, used newly created domain, now it works.

share|improve this answer

answered May 13 '13 at 16:34

Mike RuhlinMike Ruhlin

2,85011630

• 
  
  
  

  
  7
  

  
  
  
  
  
  

  
  
  You can also use http://localhost.:8888 Notice the magic dot!
  
  – Darrel Miller
  May 14 '13 at 0:08
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  I'm getting a Bad Request - Invalid Host Name when I put the . after localhost
  
  – Michael
  May 16 '13 at 16:01
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @DarrelMiller I get no changes after i add localhost. <system.net> <defaultProxy> <proxy bypassonlocal="False" usesystemdefault="True" proxyaddress="http://localhost.:8888" /> </defaultProxy> </system.net>
  
  – felickz
  Aug 25 '14 at 20:51
  
  

  
  
  
  

add a comment | 

2

Is Fiddler configured to capture traffic from all processes? Look at the status bar where you see "Capturing". It should show "All Processes" next to it. If it shows "Web browsers", click it and change it to all processes. This could be different depending on the version of Fiddler you use.

share|improve this answer

answered May 13 '13 at 16:30

BadriBadri

17k35256

add a comment | 

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49

This code worked for me:

var httpClientHandler = new HttpClientHandler
 
 Proxy = new WebProxy("http://localhost:8888", false),
 UseProxy = true
 

Note that I am not supplying an empty array to my WebProxy constructor. Perhaps that's the problem?

share|improve this answer

answered Jul 10 '14 at 12:57

NathanAldenSrNathanAldenSr

6,39733045

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Removing the string array worked for me too. I had to an entry to HOSTS to get the proxy to work on localhost.
  
  – Casey Burns
  Nov 15 '14 at 10:18
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  You just saved my day ^_^
  
  – Wahid Bitar
  Mar 17 '17 at 8:04
  

  
  
  
  

add a comment | 

49

This code worked for me:

var httpClientHandler = new HttpClientHandler
 
 Proxy = new WebProxy("http://localhost:8888", false),
 UseProxy = true
 

Note that I am not supplying an empty array to my WebProxy constructor. Perhaps that's the problem?

share|improve this answer

answered Jul 10 '14 at 12:57

NathanAldenSrNathanAldenSr

6,39733045

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Removing the string array worked for me too. I had to an entry to HOSTS to get the proxy to work on localhost.
  
  – Casey Burns
  Nov 15 '14 at 10:18
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  You just saved my day ^_^
  
  – Wahid Bitar
  Mar 17 '17 at 8:04
  

  
  
  
  

add a comment | 

This code worked for me:

var httpClientHandler = new HttpClientHandler
 
 Proxy = new WebProxy("http://localhost:8888", false),
 UseProxy = true
 

Note that I am not supplying an empty array to my WebProxy constructor. Perhaps that's the problem?

share|improve this answer

answered Jul 10 '14 at 12:57

NathanAldenSrNathanAldenSr

6,39733045

var httpClientHandler = new HttpClientHandler
 
 Proxy = new WebProxy("http://localhost:8888", false),
 UseProxy = true
 

share|improve this answer

answered Jul 10 '14 at 12:57

NathanAldenSrNathanAldenSr

6,39733045

answered Jul 10 '14 at 12:57

NathanAldenSrNathanAldenSr

6,39733045

answered Jul 10 '14 at 12:57

NathanAldenSrNathanAldenSr

6,39733045

7

Ah, The BaseAddress I was pointing to was http://localhost:8081. Turns out that despite setting BypassOnLocal to false, evidently localhost is still special enough that it bypasses the proxy.

I added a domain binding in IIS, host file entry to point that domain to 127.0.0.1, used newly created domain, now it works.

share|improve this answer

answered May 13 '13 at 16:34

Mike RuhlinMike Ruhlin

2,85011630

• 
  
  
  

  
  7
  

  
  
  
  
  
  

  
  
  You can also use http://localhost.:8888 Notice the magic dot!
  
  – Darrel Miller
  May 14 '13 at 0:08
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  I'm getting a Bad Request - Invalid Host Name when I put the . after localhost
  
  – Michael
  May 16 '13 at 16:01
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @DarrelMiller I get no changes after i add localhost. <system.net> <defaultProxy> <proxy bypassonlocal="False" usesystemdefault="True" proxyaddress="http://localhost.:8888" /> </defaultProxy> </system.net>
  
  – felickz
  Aug 25 '14 at 20:51
  
  

  
  
  
  

add a comment | 

7

Ah, The BaseAddress I was pointing to was http://localhost:8081. Turns out that despite setting BypassOnLocal to false, evidently localhost is still special enough that it bypasses the proxy.

I added a domain binding in IIS, host file entry to point that domain to 127.0.0.1, used newly created domain, now it works.

share|improve this answer

answered May 13 '13 at 16:34

Mike RuhlinMike Ruhlin

2,85011630

• 
  
  
  

  
  7
  

  
  
  
  
  
  

  
  
  You can also use http://localhost.:8888 Notice the magic dot!
  
  – Darrel Miller
  May 14 '13 at 0:08
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  I'm getting a Bad Request - Invalid Host Name when I put the . after localhost
  
  – Michael
  May 16 '13 at 16:01
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @DarrelMiller I get no changes after i add localhost. <system.net> <defaultProxy> <proxy bypassonlocal="False" usesystemdefault="True" proxyaddress="http://localhost.:8888" /> </defaultProxy> </system.net>
  
  – felickz
  Aug 25 '14 at 20:51
  
  

  
  
  
  

add a comment | 

Ah, The BaseAddress I was pointing to was http://localhost:8081. Turns out that despite setting BypassOnLocal to false, evidently localhost is still special enough that it bypasses the proxy.

I added a domain binding in IIS, host file entry to point that domain to 127.0.0.1, used newly created domain, now it works.

share|improve this answer

answered May 13 '13 at 16:34

Mike RuhlinMike Ruhlin

2,85011630

share|improve this answer

answered May 13 '13 at 16:34

Mike RuhlinMike Ruhlin

2,85011630

answered May 13 '13 at 16:34

Mike RuhlinMike Ruhlin

2,85011630

answered May 13 '13 at 16:34

Mike RuhlinMike Ruhlin

2,85011630

2

Is Fiddler configured to capture traffic from all processes? Look at the status bar where you see "Capturing". It should show "All Processes" next to it. If it shows "Web browsers", click it and change it to all processes. This could be different depending on the version of Fiddler you use.

share|improve this answer

answered May 13 '13 at 16:30

BadriBadri

17k35256

add a comment | 

2

Is Fiddler configured to capture traffic from all processes? Look at the status bar where you see "Capturing". It should show "All Processes" next to it. If it shows "Web browsers", click it and change it to all processes. This could be different depending on the version of Fiddler you use.

share|improve this answer

answered May 13 '13 at 16:30

BadriBadri

17k35256

add a comment | 

Is Fiddler configured to capture traffic from all processes? Look at the status bar where you see "Capturing". It should show "All Processes" next to it. If it shows "Web browsers", click it and change it to all processes. This could be different depending on the version of Fiddler you use.

share|improve this answer

answered May 13 '13 at 16:30

BadriBadri

17k35256

share|improve this answer

answered May 13 '13 at 16:30

BadriBadri

17k35256

answered May 13 '13 at 16:30

BadriBadri

17k35256

answered May 13 '13 at 16:30

BadriBadri

17k35256